How to make vertical middle alignment

With just 3 lines of CSS (excluding vendor prefixes) we can with the help of transform: translateY vertically center whatever we want, even if we don’t know its height. The CSS property transform is usally used for rotating and scaling elements, but with its translateY function we can now vertically align elements. Usually this must be done with absolute positioning or setting line-heights, but these require you to either know the height of the element or only works on single-line text etc. More detail