Elements get out of the div on making the screen responsive - html

Question

I have the following block of code, The problem with this is that it tends to get out of the aircard div when making the screen responsive, I dont know for what reason as shown in the picture,whereas they should stack over one another. What's the reason that they are not being responsive and how can I make them responsive. The code is as follows:
HTML:
<div class="container-fluid">
<div class="air-card">
<div class="row">
<div class="col-md-12 col-sm-12 col-xs-12 col-xs-offset-0">
<h2 class="text-center hidden-xs m-sm-bottom ng-scope"> Complete Your Account </h2>
<h4 class="text-center ng-binding ng-scope"> Yourname#gmail.com </h4> <br>
<form method="POST" action="confirm.html">
<!--<i class="fas fa-globe">--><select> <!-- </i> -->
<option value="AF">Afghanistan</option>
<option value="AX">Åland Islands</option>
<option value="AL">Albania</option>
</select> <br> <br>
<input type="password" name="" placeholder="Create a Password" required> <br> <br>
<h4 style="text-align: center;"> I want to: </h4>
<div class="btn-group btn-group-lg" align="center" style="margin-left: 400px; position: relative; border: 1px solid black;">
<button type="button" class="btn btn-light">Hire for a Project</button>
<button type="button" class="btn btn-light"> Work as a Freelancer </button>
</div> <br> <br>
<div class="custom-control custom-checkbox" style="margin-left:380px;">
<!--<input type="checkbox" class="custom-control-input" id="customCheck1">
<label class="custom-control-label" for="customCheck1"> <div class="custom-control custom-checkbox">-->
<input type="checkbox" class="custom-control-input" id="customCheck1"">
<label class="custom-control-label" for="customCheck1"> Yes! Send me genuinely useful emails every now and then to help me get the most out of Extolssolutions. </label>
<input type="checkbox" class="custom-control-input" id="customCheck1"">
</div></label>
<div class="custom-control custom-checkbox" style="margin-left:380px;">
<!--<input type="checkbox" class="custom-control-input" id="customCheck1">
<label class="custom-control-label" for="customCheck1"> <div class="custom-control custom-checkbox">-->
<input type="checkbox" class="custom-control-input" id="customCheck1" required>
<label class="custom-control-label" for="customCheck1" required> Yes, I understand and agree to the Extols Solutions Terms of Service , including the User Agreement and Privacy Policy. </label> <br> <br>
<input type="checkbox" class="custom-control-input" id="customCheck1"">
</div>
<button type="submit" class="btn btn-success"> Next </button>
</form>
</div>
</div>
</div>
</div>
CSS:
.air-card {
position: relative;
background-color: #fff;
margin: 30px 0px;
padding: 30px;
box-shadow: 0 1px 6px rgba(57,73,76,.35);
}
select
{
margin-left: 420px;
}
input[type='password']
{
margin-left: 420px;
width: 354px;
}
input[type='checkbox']
{
margin-left: 420px;
text-align: center;
}
label a:hover
{
color: green;
}
button[type='submit']
{
margin-left: 550px;
margin-top: 20px;
width: 8%;
}
.row a
{
color: #747676;
font-family: Arial,sens-serif;
}
JSBIN: http://jsbin.com/dupihupugu/1/edit?html,css,console,output
P.S, I'm relatively a newbie to both CSS,Bootstrap 4 as well as Stack overflow,so please go easy on me
[The full screen page][The responsive screen page]1

Answer 1

Try this
nav
{
background-color: #FFFFFF;
}
nav ul li
{
text-decoration: none;
}
a.navbar-brand
{
margin-left: 100px;
margin-right: 500px;
}
li
{
text-align: right;
}
p
{
display: block;
margin-bottom: 0px;
}
.footer-navbar-wrapper {
background-color: #494949;
}
.copyright
{
color: #E0E0D6;
}
.row a
{
color: #747676;
font-family: Arial,sens-serif;
}
footer
{
padding-top: 40px;
padding-bottom: 20px;
position: relative;
}
.air-card {
position: relative;
background-color: #fff;
margin: 30px 0px;
padding: 30px;
box-shadow: 0 1px 6px rgba(57,73,76,.35);
}
select
{
margin-left: 420px;
}
input[type='password']
{
width: 354px;
}
input[type='checkbox']
{
text-align: center;
}
label a:hover
{
color: green;
}
button[type='submit']
{
margin-top: 20px;
}
<!DOCTYPE html>
<html>
<head>
<title>Signup</title>
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css" integrity="sha384-Gn5384xqQ1aoWXA+058RXPxPg6fy4IWvTNh0E263XmFcJlSAwiGgFAW/dAiS6JXm" crossorigin="anonymous">
<script src="https://code.jquery.com/jquery-3.2.1.slim.min.js" integrity="sha384-KJ3o2DKtIkvYIK3UENzmM7KCkRr/rE9/Qpg6aAZGJwFDMVNA/GpGFF93hXpG5KkN" crossorigin="anonymous"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.12.9/umd/popper.min.js" integrity="sha384-ApNbgh9B+Y1QKtv3Rn7W3mgPxhU9K/ScQsAP7hUibX39j7fakFPskvXusvfa0b4Q" crossorigin="anonymous"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/js/bootstrap.min.js" integrity="sha384-JZR6Spejh4U02d8jOt6vLEHfe/JQGiRRSQQxSfFWpi1MquVdAyjUar5+76PVCmYl" crossorigin="anonymous"></script>
<!--<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css">-->
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/4.7.0/css/font-awesome.min.css">
<title> Sign Up Module </title>
<style type="text/css">
</style>
</head>
<body>
<header class="header-navbar-wrapper header-navbar-skinny ng-scope" role="banner" data-ng-controller="headerController">
<nav class="primary-navbar navbar navbar-default" role="navigation">
<a class="navbar-brand" href="#"><img src="logo.jpg"></a>
<ul class="navbar-nav">
<!--<li class="nav-item"> <a class="nav-link" href="#"> <span style="color: #6FDA44"> Extols </span> <span style="color: #4B4B4B"> Solutions</span> </a> </li>-->
<div style="text-align: center;">
<li class="nav-item"> <p> <span class="navbar-text" style="color: #767676">Already Have an Account?</span> <a class="nav-link" href="#" style="color: #178329">Log in</a></p></li>
</div>
</ul>
</nav>
</header>
<div class="container-fluid">
<div class="air-card">
<div class="">
<div class="row">
<div class="col-md-12 col-sm-12 col-xs-12 col-xs-offset-0">
<h2 class="text-center hidden-xs m-sm-bottom ng-scope"> Complete Your Account </h2>
<h4 class="text-center ng-binding ng-scope"> Yourname#gmail.com </h4> <br>
<form method="POST" action="confirm.html">
<!--<i class="fas fa-globe">--><div align="center">
<select > <!-- </i> -->
<option value="AF">Afghanistan</option>
<option value="AX">Åland Islands</option>
<option value="AL">Albania</option>
<option value="DZ">Algeria</option>
<option value="AS">American Samoa</option>
<option value="AD">Andorra</option>
<option value="AO">Angola</option>
<option value="AI">Anguilla</option>
<option value="AQ">Antarctica</option>
<option value="AG">Antigua and Barbuda</option>
<option value="AR">Argentina</option>
<option value="AM">Armenia</option>
<option value="AW">Aruba</option>
<option value="AU">Australia</option>
<option value="AT">Austria</option>
<option value="AZ">Azerbaijan</option>
<option value="BS">Bahamas</option>
<option value="BH">Bahrain</option>
<option value="BD">Bangladesh</option>
<option value="BB">Barbados</option>
<option value="BY">Belarus</option>
<option value="BE">Belgium</option>
<option value="BZ">Belize</option>
<option value="BJ">Benin</option>
<option value="BM">Bermuda</option>
<option value="BT">Bhutan</option>
<option value="BO">Bolivia, Plurinational State of</option>
<option value="BQ">Bonaire, Sint Eustatius and Saba</option>
<option value="BA">Bosnia and Herzegovina</option>
<option value="BW">Botswana</option>
<option value="BV">Bouvet Island</option>
<option value="BR">Brazil</option>
<option value="IO">British Indian Ocean Territory</option>
<option value="BN">Brunei Darussalam</option>
<option value="BG">Bulgaria</option>
<option value="BF">Burkina Faso</option>
<option value="BI">Burundi</option>
<option value="KH">Cambodia</option>
<option value="CM">Cameroon</option>
<option value="CA">Canada</option>
<option value="CV">Cape Verde</option>
<option value="KY">Cayman Islands</option>
<option value="CF">Central African Republic</option>
<option value="TD">Chad</option>
<option value="CL">Chile</option>
<option value="CN">China</option>
<option value="CX">Christmas Island</option>
<option value="CC">Cocos (Keeling) Islands</option>
<option value="CO">Colombia</option>
<option value="KM">Comoros</option>
<option value="CG">Congo</option>
<option value="CD">Congo, the Democratic Republic of the</option>
<option value="CK">Cook Islands</option>
<option value="CR">Costa Rica</option>
<option value="CI">Côte d'Ivoire</option>
<option value="HR">Croatia</option>
<option value="CU">Cuba</option>
<option value="CW">Curaçao</option>
<option value="CY">Cyprus</option>
<option value="CZ">Czech Republic</option>
<option value="DK">Denmark</option>
<option value="DJ">Djibouti</option>
<option value="DM">Dominica</option>
<option value="DO">Dominican Republic</option>
<option value="EC">Ecuador</option>
<option value="EG">Egypt</option>
<option value="SV">El Salvador</option>
<option value="GQ">Equatorial Guinea</option>
<option value="ER">Eritrea</option>
<option value="EE">Estonia</option>
<option value="ET">Ethiopia</option>
<option value="FK">Falkland Islands (Malvinas)</option>
<option value="FO">Faroe Islands</option>
<option value="FJ">Fiji</option>
<option value="FI">Finland</option>
<option value="FR">France</option>
<option value="GF">French Guiana</option>
<option value="PF">French Polynesia</option>
<option value="TF">French Southern Territories</option>
<option value="GA">Gabon</option>
<option value="GM">Gambia</option>
<option value="GE">Georgia</option>
<option value="DE">Germany</option>
<option value="GH">Ghana</option>
<option value="GI">Gibraltar</option>
<option value="GR">Greece</option>
<option value="GL">Greenland</option>
<option value="GD">Grenada</option>
<option value="GP">Guadeloupe</option>
<option value="GU">Guam</option>
<option value="GT">Guatemala</option>
<option value="GG">Guernsey</option>
<option value="GN">Guinea</option>
<option value="GW">Guinea-Bissau</option>
<option value="GY">Guyana</option>
<option value="HT">Haiti</option>
<option value="HM">Heard Island and McDonald Islands</option>
<option value="VA">Holy See (Vatican City State)</option>
<option value="HN">Honduras</option>
<option value="HK">Hong Kong</option>
<option value="HU">Hungary</option>
<option value="IS">Iceland</option>
<option value="IN">India</option>
<option value="ID">Indonesia</option>
<option value="IR">Iran, Islamic Republic of</option>
<option value="IQ">Iraq</option>
<option value="IE">Ireland</option>
<option value="IM">Isle of Man</option>
<option value="IL">Israel</option>
<option value="IT">Italy</option>
<option value="JM">Jamaica</option>
<option value="JP">Japan</option>
<option value="JE">Jersey</option>
<option value="JO">Jordan</option>
<option value="KZ">Kazakhstan</option>
<option value="KE">Kenya</option>
<option value="KI">Kiribati</option>
<option value="KP">Korea, Democratic People's Republic of</option>
<option value="KR">Korea, Republic of</option>
<option value="KW">Kuwait</option>
<option value="KG">Kyrgyzstan</option>
<option value="LA">Lao People's Democratic Republic</option>
<option value="LV">Latvia</option>
<option value="LB">Lebanon</option>
<option value="LS">Lesotho</option>
<option value="LR">Liberia</option>
<option value="LY">Libya</option>
<option value="LI">Liechtenstein</option>
<option value="LT">Lithuania</option>
<option value="LU">Luxembourg</option>
<option value="MO">Macao</option>
<option value="MK">Macedonia, the former Yugoslav Republic of</option>
<option value="MG">Madagascar</option>
<option value="MW">Malawi</option>
<option value="MY">Malaysia</option>
<option value="MV">Maldives</option>
<option value="ML">Mali</option>
<option value="MT">Malta</option>
<option value="MH">Marshall Islands</option>
<option value="MQ">Martinique</option>
<option value="MR">Mauritania</option>
<option value="MU">Mauritius</option>
<option value="YT">Mayotte</option>
<option value="MX">Mexico</option>
<option value="FM">Micronesia, Federated States of</option>
<option value="MD">Moldova, Republic of</option>
<option value="MC">Monaco</option>
<option value="MN">Mongolia</option>
<option value="ME">Montenegro</option>
<option value="MS">Montserrat</option>
<option value="MA">Morocco</option>
<option value="MZ">Mozambique</option>
<option value="MM">Myanmar</option>
<option value="NA">Namibia</option>
<option value="NR">Nauru</option>
<option value="NP">Nepal</option>
<option value="NL">Netherlands</option>
<option value="NC">New Caledonia</option>
<option value="NZ">New Zealand</option>
<option value="NI">Nicaragua</option>
<option value="NE">Niger</option>
<option value="NG">Nigeria</option>
<option value="NU">Niue</option>
<option value="NF">Norfolk Island</option>
<option value="MP">Northern Mariana Islands</option>
<option value="NO">Norway</option>
<option value="OM">Oman</option>
<option value="PK">Pakistan</option>
<option value="PW">Palau</option>
<option value="PS">Palestinian Territory, Occupied</option>
<option value="PA">Panama</option>
<option value="PG">Papua New Guinea</option>
<option value="PY">Paraguay</option>
<option value="PE">Peru</option>
<option value="PH">Philippines</option>
<option value="PN">Pitcairn</option>
<option value="PL">Poland</option>
<option value="PT">Portugal</option>
<option value="PR">Puerto Rico</option>
<option value="QA">Qatar</option>
<option value="RE">Réunion</option>
<option value="RO">Romania</option>
<option value="RU">Russian Federation</option>
<option value="RW">Rwanda</option>
<option value="BL">Saint Barthélemy</option>
<option value="SH">Saint Helena, Ascension and Tristan da Cunha</option>
<option value="KN">Saint Kitts and Nevis</option>
<option value="LC">Saint Lucia</option>
<option value="MF">Saint Martin (French part)</option>
<option value="PM">Saint Pierre and Miquelon</option>
<option value="VC">Saint Vincent and the Grenadines</option>
<option value="WS">Samoa</option>
<option value="SM">San Marino</option>
<option value="ST">Sao Tome and Principe</option>
<option value="SA">Saudi Arabia</option>
<option value="SN">Senegal</option>
<option value="RS">Serbia</option>
<option value="SC">Seychelles</option>
<option value="SL">Sierra Leone</option>
<option value="SG">Singapore</option>
<option value="SX">Sint Maarten (Dutch part)</option>
<option value="SK">Slovakia</option>
<option value="SI">Slovenia</option>
<option value="SB">Solomon Islands</option>
<option value="SO">Somalia</option>
<option value="ZA">South Africa</option>
<option value="GS">South Georgia and the South Sandwich Islands</option>
<option value="SS">South Sudan</option>
<option value="ES">Spain</option>
<option value="LK">Sri Lanka</option>
<option value="SD">Sudan</option>
<option value="SR">Suriname</option>
<option value="SJ">Svalbard and Jan Mayen</option>
<option value="SZ">Swaziland</option>
<option value="SE">Sweden</option>
<option value="CH">Switzerland</option>
<option value="SY">Syrian Arab Republic</option>
<option value="TW">Taiwan, Province of China</option>
<option value="TJ">Tajikistan</option>
<option value="TZ">Tanzania, United Republic of</option>
<option value="TH">Thailand</option>
<option value="TL">Timor-Leste</option>
<option value="TG">Togo</option>
<option value="TK">Tokelau</option>
<option value="TO">Tonga</option>
<option value="TT">Trinidad and Tobago</option>
<option value="TN">Tunisia</option>
<option value="TR">Turkey</option>
<option value="TM">Turkmenistan</option>
<option value="TC">Turks and Caicos Islands</option>
<option value="TV">Tuvalu</option>
<option value="UG">Uganda</option>
<option value="UA">Ukraine</option>
<option value="AE">United Arab Emirates</option>
<option value="GB">United Kingdom</option>
<option value="US" selected>United States</option>
<option value="UM">United States Minor Outlying Islands</option>
<option value="UY">Uruguay</option>
<option value="UZ">Uzbekistan</option>
<option value="VU">Vanuatu</option>
<option value="VE">Venezuela, Bolivarian Republic of</option>
<option value="VN">Viet Nam</option>
<option value="VG">Virgin Islands, British</option>
<option value="VI">Virgin Islands, U.S.</option>
<option value="WF">Wallis and Futuna</option>
<option value="EH">Western Sahara</option>
<option value="YE">Yemen</option>
<option value="ZM">Zambia</option>
<option value="ZW">Zimbabwe</option>
</select> <br> <br>
</div>
<div align="center">
<input type="password" name="" placeholder="Create a Password" required> <br> <br>
</div>
<div align="left">
<h4 style="text-align: center;"> I want to: </h4>
<div class="btn-group btn-group-lg" align="center" style=" border: 1px solid black;margin-left:21%">
<button type="button" class="btn btn-light">Hire for a Project</button>
<button type="button" class="btn btn-light"> Work as a Freelancer </button>
</div> <br> <br>
<div class="custom-control custom-checkbox" style="margin-left:200px;">
<!--<input type="checkbox" class="custom-control-input" id="customCheck1">
<label class="custom-control-label" for="customCheck1"> <div class="custom-control custom-checkbox">-->
<input type="checkbox" class="custom-control-input" id="customCheck1">
<label class="custom-control-label" for="customCheck1"> Yes! Send me genuinely useful emails every now and then to help me get the most out of Extolssolutions. </label>
<input type="checkbox" class="custom-control-input" id="customCheck1">
</div>
<div class="custom-control custom-checkbox" style="margin-left:200px;">
<label class="custom-control-label" for="customCheck1"> <div class="custom-control custom-checkbox">
<input type="checkbox" class="custom-control-input" id="customCheck1" required>
<label class="custom-control-label" for="customCheck1" required> Yes, I understand and agree to the Extols Solutions Terms of Service , including the User Agreement and Privacy Policy. </label> <br> <br>
<input type="checkbox" class="custom-control-input" id="customCheck1">
</div></div>
<div align="center">
<button type="submit" class="btn btn-success btn-lg"> Next </button>
</div> </form>
</div><br/>
</div>
</div>
</div>
<footer class="footer-navbar-wrapper footer-skinny ng-scope" role="contentinfo" data-ng-controller="footerController">
<div class="container">
<div class="row">
<div class="col-md-12 text-center">
<p class="copyright" > © 2015-2018 Extols Solutions Inc </p>
Terms of Service
<br>
Privacy Policy
</div>
</div>
</div>
</footer>
</body>
</html>