Easiest way to vertically centre an element in CSS

I’ve used many different ways to centre an element in CSS, this is the best way I’ve found so far (with bootstrap also).

.inmiddle { position: relative; top: 50%; -moz-transform: translateY(-50%); -ms-transform: translateY(-50%); -o-transform: translateY(-50%); -webkit-transform: translateY(-50%); transform: translateY(-50%); }

The above applied to the containing element centres itself and is responsive.