Vertically & Horizontally Align inner DIV center of the page [duplicate]

Answer 1

If you know the exact size of the block you want to align it's the easiest way to do this: jsfiddle

add this style to your .InnerContainer

.InnerContainer{
  width: 400px;
  height: 350px;
  border-left: 1px solid;
  border-right: 1px solid;
  border-color: #f5f5f5;
  margin: 0 auto;
  padding: 0;
  font-size: 12px;
  background-color: red;
  position: relative;
  left: 50%;
  top: 50%;
  margin-left: -200px;
  margin-top: -175px;
}