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Here you can Sed posuere consectetur est at lobortis. Donec ullamcorper nulla non metus auctor fringilla. Maecenas sed diam eget risus varius blandit sit amet non magna. Donec id elit non mi porta gravida at eget metus. Praesent commodo cursus magna, vel scelerisque nisl consectetur et.

HTML

            
              <h2>62.5em = 1000px = 100%</h2>

<section class="example1 clearfix">
    <p>The <code>.content</code> and the <code>.sidebar</code> with relative widths:</p>
    <div class="content"><b>70%</b></div>
    <div class="sidebar"><b>30%</b></div>
</section>

<section class="example2 clearfix">
    <p>The <code>.content</code> and the <code>.sidebar</code> with relative widths and relative gap:</p>
    <div class="content"><b>68%</b></div>
    <div class="sidebar"><b>30%</b></div>
</section>

<section class="example3 clearfix">
    <p class="widescreens">The <code>.content</code> with relative width while the <code>.sidebar</code> has fixed width:</p>
    <p class="narrowscreens"><code>.content</code> and <code>.sidebar</code> with relative widths:</p>
    <div class="content"><b><span>100%</span> &ndash; 20em</b><br> 20em = 320px = 32%</div>
    <div class="sidebar"><b>18.75em</b><br> 300px</div>
</section>

<section class="example4 clearfix">
    <p class="widescreens">The <code>.nav</code> and the <code>.sidebar</code> with fixed widths while the <code>.content</code> has relative width:</p>
    <p class="narrowscreens"><code>.nav</code>, <code>.content</code> and <code>.sidebar</code> with relative widths:</p>
    <div class="nav"><b>12.5em</b><br> 200px</div>  
  <div class="content"><b><span>100%</span> &ndash; 27.5em</b><br> 27.5em = 440px = 44%</div>
    <div class="sidebar"><b>12.5em</b><br> 200px</div>
</section>
            
          
!

CSS

            
              * {
    -webkit-box-sizing: border-box;
       -moz-box-sizing: border-box;
            box-sizing: border-box;
}
section {
    margin: 0 auto;
    max-width: 65em; /* 1040px */
    padding: 1.25em; /* 20px */
    width: 100%;
}
.content {
    float: left;
    width: 70%; /* 700px */
}
.sidebar {
    float: right;
    width: 30%; /* 300px */
}
.widescreens {
    display: block;
}
.narrowscreens {
    display: none;
}

/* EXAMPLE 2 */
.example2 .content {
    width: 68%; /* 680px */
}
.example2 .sidebar {
    width: 30%; /* 300px */
}

/* EXAMPLE 3 */
.example3 .content {
    width: 68%; /* 680px */
    width: -webkit-calc(100% - 20em); /* 100% ‒ 320px */
    width:    -moz-calc(100% - 20em);
    width:         calc(100% - 20em);
}
.example3 .sidebar {
    width: 30%; /* 300px */
    width: -webkit-calc(18.75em); /* 300px */
    width:    -moz-calc(18.75em);
    width:         calc(18.75em);
}
@media (max-width: 40em) { /* breakpoint for 400px */
    .example3 .widescreens {
        display: none;
    }
    .example3 .narrowscreens {
        display: block;
    }
    .example3 .content,
    .example3 .sidebar {
        float: none;
        position: relative;
        width: 100%;
    }
    .example3 .content:after,
    .example3 .sidebar:after {
        content: "100%";
        position: absolute;
        width: 100%;
        height: 100%;
        top: 0;
        left: 0;
        line-height: 5em;
    }
    .example3 .sidebar:after {
        background-color: wheat;
    }
    .example3 .content:after {
        background-color: lightblue;
    }
    .example3 .sidebar {
        margin-top: 1.25em;
    }
}

/* EXAMPLE 4 */
.example4 .nav {
    float: left;
}
.example4 .content {
    margin-left: 1.25em; /* 20px */
    width: 56%; /* 560px */
    width: -webkit-calc(100% - 27.5em); /* 100% ‒ 440px */
    width:    -moz-calc(100% - 27.5em);
    width:         calc(100% - 27.5em);
}
.example4 .nav,
.example4 .sidebar {
    width: 20%; /* 200px */
    width: -webkit-calc(12.5em); /* 200px */
    width:    -moz-calc(12.5em);
    width:         calc(12.5em);
}
@media (max-width: 47em) { /* breakpoint for 470px */
    .example4 .widescreens {
        display: none;
    }
    .example4 .narrowscreens {
        display: block;
    }
    .example4 .content,
    .example4 .nav,
    .example4 .sidebar {
        float: none;
        position: relative;
        width: 100%;
    }
    .example4 .content:after,
    .example4 .nav:after,
    .example4 .sidebar:after {
        content: "100%";
        position: absolute;
        width: 100%;
        height: 100%;
        top: 0;
        left: 0;
        line-height: 5em;
    }
    .example4 .nav:after,
    .example4 .sidebar:after {
        background-color: wheat;
    }
    .example4 .content:after {
        background-color: lightblue;
    }
    .example4 .content,
    .example4 .sidebar{
        margin-top: 1.25em;
        margin-left: 0;
    }
}







/* JUST FOR AESTHETICS */
body {
    background-color: lightgrey;
    color: #444;
    padding: 1.25em; /* 20px */
}
h2 {
    color: #666;
    margin: 0 0 .75em;
    text-align: center;
}
section {
    background-color: white;
    margin-bottom: 1.25em; /* 20px */
}
p {
    margin: 0 0 .5em;
}
code {
    background-color: lightgrey;
    margin: 0 .25em;
    padding: 0 .25em;
}
span {
    color: red;
}
.content,
.sidebar,
.nav {
    padding: 1.25em; /* 20px */
    text-align: center;
}
.content {
    background-color: lightblue;
}
.sidebar, .nav {
    background-color: wheat;
}
.clearfix:before,
.clearfix:after {
    content: " ";
    display: table;
}
.clearfix:after {
    clear: both;
}
* {
    -webkit-transition: all .2s ease;
       -moz-transition: all .2s ease;
            transition: all .2s ease;
}
            
          
!

JS

            
              /*!

CSS CALC
  
62.5em = 1000px = 100%
1em = 16px = 1.6%
1.25em = 20px = 2%
...

Note 1: WebKit and Firefox currently require a browser prefix for calc()

Note 2: Be sure to use whitespace around operators so that they aren't construed as positive/negative notations.

CanIUse?
Not supported in Android less than 4.4 (KitKat) and Opera Mini (as of december/2013)

http://caniuse.com/#search=calc

***

Last update: 2013-12-18

- Added a fallback for browsers that doesn't support calc() yet.
Thanks to Osvaldas Valutis > http://osvaldas.info/imitating-calc-fallback-fixed-width-sidebar-in-responsive-layout

- Added media queries just for fun

*/
            
          
!
999px

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