100% минимальная высота макета CSS

body, html {
  height: 100%;
}
#outerbox {
  width: 100%;
  position: absolute; /* to place it somewhere on the screen */
  top: 130px;         /* free space at top */
  bottom: 0;          /* makes it lock to the bottom */
}
#innerbox {
  width: 100%;
  position: absolute;				
  min-height: 100% !important; /* browser fill */
  height: auto;                /*content fill */
}