CSS position:relative + position:absolute

If we set relative positioning on div-1, any elements within div-1 will be positioned relative to div-1. Then if we set absolute positioning on div-1a, we can move it to the top right of div-1:

#div-1 { 

 position:relative; 

} 

#div-1a { 

 position:absolute;

 top:0;

 right:0;

 width:200px; 

}

Read more at "Learn CSS Positioning in Ten Steps" tutorial