Remove padding from columns in Bootstrap 3

You’d normally use .row to wrap two columns, not .col-md-12 – that’s a column encasing another column. Afterall, .row doesn’t have the extra margins and padding that a col-md-12 would bring and also discounts the space that a column would introduce with negative left & right margins.

<div class="container">
    <div class="row">
        <h2>OntoExplorer<span style="color:#b92429">.</span></h2>

        <div class="col-md-4 nopadding">
            <div class="widget">
                <div class="widget-header">
                    <h3>Dimensions</h3>
                </div>
                <div class="widget-content">
                </div>
            </div>
        </div>

        <div class="col-md-8 nopadding">
            <div class="widget">
                <div class="widget-header">
                    <h3>Results</h3>
                </div>
                <div class="widget-content">
                </div>
            </div>
        </div>
    </div>
</div>

if you really wanted to remove the padding/margins, add a class to filter out the margins/paddings for each child column.

.nopadding {
   padding: 0 !important;
   margin: 0 !important;
}