Web page layout appearing differently on different screens - html

Question

I have designed my web page,
HTML code,
<div class="firstDiv"></div>
<div class="secondDiv"></div>
<div class="loginDiv">
<form>
<div class="row center">
<i class="fa fa-user-circle"></i>
</div>
<div class="container">
<input type="text" placeholder="Username" name="uname" required>
<input type="password" placeholder="Password" name="psw" required>
<br/>
<br/>
<button mat-button (click)="submit()">Login</button>
<br/>
<label>
<input type="checkbox" checked="checked" name="remember"> Remember me
</label>
</div>
</form>
</div>
CSS code,
#import '~#angular/material/theming';
#include mat-core();
$yaana-app-primary: mat-palette($mat-orange, 800,400,200);
.firstDiv {
height: 40%;
width: 100%;
top: 0;
left: 0;
right: 0;
position: absolute;
background-color: orangered;
display: inline-block;
}
.secondDiv {
position: absolute;
width: 100%;
bottom: 0;
height: 60%;
left: 0;
right: 0;
background-color:whitesmoke;
display: inline-block;
}
.loginDiv {
border: 1px solid black;
background: white;
left: 50%;
position: absolute;
top: 28%;
transform: translate(-50%);
background-color: #fff;
padding: 15px;
box-shadow:1px 3px 10px rgba(0, 0, 0, 0.34);
}
input[type=text], input[type=password] {
width: 100%;
padding: 12px 20px;
margin: 8px 0;
display: inline-block;
border: 1px solid #ccc;
box-sizing: border-box;
}
button {
width: 60%;
height: 20%;
line-height: 36px;
background: transparent;
border-radius: 3px;
will-change: transform;
-webkit-transition: all .2s ease;
transition: all .2s ease;
border: none;
/*border: 2px solid #FF5126;*/
cursor: pointer;
background: #F26722;
font-size: 16px;
color: #fff;
outline: none;
text-align: center;
padding: 0 6px;
margin: 6px 8px;
display: block;
margin: auto;
font-size: 14px;
box-shadow: 0 2px 5px 0 rgba(0, 0, 0, 0.26);
text-transform: uppercase !important;
}
button:hover {
opacity: 0.8;
}
.loginImgContainer {
display: table;
max-height: 40px;
max-width: 40px;
}
i.fa {
background: #fff;
display: inline-block;
font-size: 80px;
transform: translateY(-60%);
transform: translateX(160%);
border-radius: 50%;
margin: auto;
position: relative;
}
And when I run the web page I am getting different views,
1) For Desktop Browser
2) For small screens such as IPhone 6
3) For Ipad Pro,
I wanted the user icon to appear at centre but it is getting deviated from centre based on screen sizes.

Answer 1

Using a flexbox for the row that contains the circle. Documentation in the source.
/* Added display flex for circle row */
div.row.center {
display: flex;
justify-content: center;
width: 100%;
}
.firstDiv {
height: 40%;
width: 100%;
top: 0;
left: 0;
right: 0;
position: absolute;
background-color: orangered;
display: inline-block;
}
.secondDiv {
position: absolute;
width: 100%;
bottom: 0;
height: 60%;
left: 0;
right: 0;
background-color: whitesmoke;
display: inline-block;
}
.loginDiv {
border: 1px solid black;
background: white;
left: 50%;
position: absolute;
top: 28%;
transform: translate(-50%);
background-color: #fff;
padding: 15px;
box-shadow: 1px 3px 10px rgba(0, 0, 0, 0.34);
}
input[type=text],
input[type=password] {
width: 100%;
padding: 12px 20px;
margin: 8px 0;
display: inline-block;
border: 1px solid #ccc;
box-sizing: border-box;
}
button {
width: 60%;
height: 20%;
line-height: 36px;
background: transparent;
border-radius: 3px;
will-change: transform;
-webkit-transition: all .2s ease;
transition: all .2s ease;
border: none;
/*border: 2px solid #FF5126;*/
cursor: pointer;
background: #F26722;
font-size: 16px;
color: #fff;
outline: none;
text-align: center;
padding: 0 6px;
margin: 6px 8px;
display: block;
margin: auto;
font-size: 14px;
box-shadow: 0 2px 5px 0 rgba(0, 0, 0, 0.26);
text-transform: uppercase !important;
}
button:hover {
opacity: 0.8;
}
.loginImgContainer {
display: table;
max-height: 40px;
max-width: 40px;
}
i.fa {
background: #fff;
display: inline-block;
font-size: 80px;
/* transform: translateY(-60%); removed */
/* transform: translateX(160%); removed */
border-radius: 50%;
/* margin: auto; removed */
/* position: relative; removed */
}
<link href="https://stackpath.bootstrapcdn.com/font-awesome/4.7.0/css/font-awesome.min.css" rel="stylesheet" />
<div class="firstDiv"></div>
<div class="secondDiv"></div>
<div class="loginDiv">
<form>
<div class="row center">
<i class="fa fa-user-circle"></i>
</div>
<div class="container">
<input type="text" placeholder="Username" name="uname" required>
<input type="password" placeholder="Password" name="psw" required>
<br/>
<br/>
<button mat-button (click)="submit()">Login</button>
<br/>
<label>
<input type="checkbox" checked="checked" name="remember"> Remember me
</label>
</div>
</form>
</div>

Answer 2

try this for your circle div
position: absolute;
left: 0;
right: 0;
margin: auto;

Answer 3

Super easy to fix.
You have transforms on your circle for some reason see code:
i.fa {
background: #fff;
display: inline-block;
font-size: 80px;
/* transform: translateY(-60%); */
/* transform: translateX(160%); */
border-radius: 50%;
margin: auto;
position: relative;
}
Remove these 2 lines commented out and then add the following css:
.center {
text-align: center;
}