CSS fluid layout for inputs - html

Question

I am currently making a website and the sign up page requires:
- first name
- last name
- username
- email
- password
- retype password
I need the first name and last name inputs to be side by side and small while the others below them are approximately twice the width.
Like this:
Name
+-----------+ +-----------+
| first | | last |
+-----------+ +-----------+
Email
+----------------------------+
| |
+----------------------------+
I am extremely opposed to using px and absolutely need to use % for the widths.
I cannot make the small inputs 50% and the large ones 100% because the space in between the two small ones is not accounted for, you know?
I'm talking about this space:
Name
+-----------+ +-----------+
| first |<-->| last |
+-----------+ +-----------+
So that is why I can't use 50% for small ones and 100% for large ones!
Any help is greatly appreciated!

Answer 1

Simple do this:
call the small ones : half
.first {margin-left: 0 !important; clear: left;}
.full {width:100%}
.half {width: 48%;}
.half {float: left; margin-left: 2%;}
<div class="first half">First Name</div>
<div class="half">Last Name input</div>
<div class="full">Email Input</div>
As you can see I used margin % to make the spacing...which thats how I made 48% -2%(you can do whatever you like as long as it equals..).
I made a class called .first to make things look right (you can use jquery to create this an auto class).
Heres a Fiddle:
FIDDLE THAT
Hope this helps you.

Answer 2

Here's a Fiddle
<form>
<input name="firstname" type="text" placeholder="First Name" class="small left"/>
<input name="lastname" type="text" placeholder="Last Name" class="small"/>
<input name="username" type="text" placeholder="User Name" class="big"/>
<input name="email" type="text" placeholder="E-mail" class="big"/>
<input name="password" type="password" placeholder="Password" class="big"/>
<input name="rpassword" type="password" placeholder="Repeat Password" class="big"/>
<button name="submit" type="">Sign Up</button>
</form>
form {
background: #555;
width: 350px;
height: 300px;
text-align: center;
padding: 30px 15px;
border-radius: 10px;
}
button {
background: #04a9e8;
position: relative;
margin: 25% auto;
width: 140px;
height: 24px;
border: 1px solid #444;
letter-spacing: 1px;
font-weight: bold;
color: #fff;
border-radius: 4px;
}
button:hover {
background: #02b9fc;
}
.small,
.big {
background: #f5f5f5;
height: 22px;
padding-left: 4px;
margin-bottom: 12px;
border: 1px solid #444;
}
.small:focus,
.big:focus {
background: #fff;
outline: none;
border: 1px solid #0296cc;
box-shadow: 0 0 2px 0 #0296cc;
}
.small {
width: 45.5%;
}
.big {
width: 98.1%;
}
.left {
margin-right: 15px;
}

Answer 3

if you apply 100% with on input element it will overflow the div box because input element has some default padding, for perfect solution you should use this:
Your CSS:
input{
box-sizing:border-box;
-moz-box-sizing:border-box; /* Firefox */
}
.clearfix { clear: both; }
.first, .last{ width: 48%; }
.first{ float: left; }
.last{ float: right; }
.email{ width: 100%;}
Your HTML:
<div class="clearfix">
<label>Name</label><br>
<input type="text" class="first">
<input type="text" class="last">
</div>
<div class="clearfix">
<label>Email</label><br>
<input type="text" class="email">
</div>
You can checkout this page to know how to align layout with float - http://www.tutorialrepublic.com/css-tutorial/css-alignment.php