Spiderman is a mixin to absolute position an element in his first relative parent, top to bottom, left to right.

spiderman.scss

//
// Spiderman is a mixin to absolute position an element 
// in his first relative parent, top to bottom, left to right.
//
// @param $offset Offset from the edge
//
@mixin spiderman($offset: 0) {
  bottom: $offset;
  left: $offset;
  position: absolute;
  right: $offset;
  top: $offset;
}