CSS - 4 columns (fixed fluid fluid fixed) - css

Question

I have seen examples of three columns (fixed fluid fixed). However, I need an example of a four column solution.
The two outer columns are fixed.
The two inner columns are fluid.
Fixed | Fluid | Fluid | Fixed

Answer 1

You can use calc.
.first, .last {
width: 300px;
}
.middle {
width: calc(50% - 300px);
}
You may want to apply vendor prefixes too.

Answer 2

HTML
<div id="framecontentLeft">
<div class="innertube">
<h1>Left Frame 1</h1>
</div>
</div>
<div id="framecontentRight">
<div class="innertube">
<h1>Right Frame 4</h1>
</div>
</div>
<div id="maincontent">
<div class="inner1">
<h1>Middle Frame 2</h1>
</div>
<div class="inner2">
<h1>Middle Frame 3</h1>
</div>
</div>
CSS
#framecontentLeft, #framecontentRight{
position: fixed;
top: 0;
left: 0;
width: 200px;
height: 100%;
background-color: navy;
color: white;
}
#framecontentRight{
left: auto;
right: 0;
width: 150px;
background-color: navy;
color: white;
}
#maincontent{
position: fixed;
top: 0;
left: 200px;
right: 150px;
bottom: 0;
background: #fff;
overflow: hidden;
}
.inner1{
height: 100%;
background:red;
width:50%;
float:left;
}
.inner2{
background:green;
height: 100%;
width:50%;
float:right;
}
DEMO

Answer 3

I like flexbox better than calc, if you can use it. It’s more… flexible.
<div id="container">
<div class="fixed">
Fixed
</div>
<div class="fluid">
Fluid
</div>
<div class="fluid">
Fluid
</div>
<div class="fixed">
Fixed
</div>
</div>
#container {
display: flex;
}
.fixed {
width: 15em;
}
.fluid {
flex: 1;
}
Dabblet. This, of course, makes all columns the same height, and if you can assume that, doing it without flexbox is also no problem given one more container (noting that if the fluid elements won’t necessarily be taller than the fixed ones, then you should give the inner container a max-height):
<div id="container">
<div class="fixed left">
Fixed
</div>
<!-- Fluid container! No, you don’t have to call it this. -->
<div class="bottle">
<div class="fluid">
Fluid
</div>
<div class="fluid">
Fluid
</div>
</div>
<div class="fixed right">
Fixed
</div>
</div>
#container {
position: relative;
}
.fixed {
bottom: 0;
position: absolute;
top: 0;
width: 15em;
}
.fixed.left {
left: 0;
}
.fixed.left {
right: 0;
}
.bottle {
margin: 0 15em;
overflow: hidden;
}
.fluid {
float: left;
width: 50%;
}
And, of course, if .bottle overflows, you’ll need some kind of clearing ::after.