body{
  background-color: #000;
}
.overlay{
  position: absolute;
  width: 100%;
  height: 100%;
  z-index: 10;
  background-color: rgba(0,0,0,0); /*don't dim the background*/
}
.navlinks {
    position: absolute;
    bottom: 20px;
    left: 50%;
    z-index: 15;
    width: 60%;
    padding-left: 0;
    margin-left: -30%;
    text-align: right;
    list-style: none;
}