Vertically centering a div inside another div [duplicate]

Answer 1

Vertically centering a div inside another div

#outerDiv{
  width: 500px;
  height: 500px;
  position:relative;
  
  background-color: lightgrey;  
}

#innerDiv{
  width: 284px;
  height: 290px;
  
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  -ms-transform: translate(-50%, -50%); /* IE 9 */
  -webkit-transform: translate(-50%, -50%); /* Chrome, Safari, Opera */	
  
  background-color: grey;
}