css with left and right
by mslocum
HTML
<div class="parent">
<div class="left_and_right">
</div>
</div>
CSS
.parent {
background: #5187ef;
height: calc(100vh - 20px);
position: relative;
}
.left_and_right {
background: #e86e00;
position: absolute;
bottom: 0;
left: 10px;
right: 10px;
height: 20%;
}