Reply To: How do we pop up a new "section" onto a page like gmail? (SOLVED)

[mw84]

The key is as follows (particularly, position: fixed) :

.add-window {
  min-width: 350px;
  position: fixed;
  bottom: 0px;
  right: 10px;
  border: 1px solid black;
  background-color: white;
}