This describes the vertical offset for the bottom edge of the absolutely positioned element box from the bottom edge of the element's containing block. For relatively positioned boxes, the offsets are relative to where the box would appear normally in the document flow. Positive values are above the parent block's bottom edge and negative values are below.
h2 {
display: block;
position: absolute;
top: 20px;
right: 50px;
bottom: 20px;
left: 50px
}
some text