full - 25%;
}

.bit-25 {
    width: $full - 75%;
}</code></pre>
            <p>Let me explain this in a little more detail. $full is basically a Sass variable of 100%, so by creating these custom columns we are basically taking 100% and subtracting a number. Creating the columns are really easy as long as they equal to 100% inline.</p>
            <hr>
            <h5>Articles</h5>
            <a href="http://webdesign.tutsplus.com/articles/build-a-freshly-squeezed-responsive-grid-system--webdesign-14888">B