How do I position a div at the bottom center of the screen

Question

I have this css:

#manipulate
{
  position:absolute;
  width:300px;
  height:300px;
  background:#063;
  bottom:0px;
  right:25%;
}

I have t

Answer 1

If you aren't comfortable with using negative margins, check this out.

HTML -

 Your Text

CSS -

div {
  position: fixed;
  left: 50%;
  bottom: 20px;
  transform: translate(-50%, -50%);
  margin: 0 auto;
}

Especially useful when you don't know the width of the div.