Just add
position: relative;
top: 50%;
transform: translateY(-50%);
to the inner div.
What it does is moving the inner div’s top border to the half height of the outer div (top: 50%;
) and then the inner div up by half its height (transform: translateY(-50%)
). This will work with position: absolute
or relative
.
Keep in mind that transform
and translate
have vendor prefixes which are not included for simplicity.
Codepen: http://codepen.io/anon/pen/ZYprdb