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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