Center a div vertically

Use Cascading StyleSheets to center a child div within a container div

Given that you have a generic HTML page like this

Text
Inner Text
Inner Text

Now I want  to hide the top div and then move the bottom div into the center of the container.  This is a contrived example, but accomplishes the goal.  Use the transform directive of CSS to do it like so transform: translateY(-50%);

Text
Inner Text
Inner Text