#cont {
	width: 100%;
	height: 100%;
	overflow: hidden;
	position: absolute;
	top: 0;
	left: 0;
	z-index: 70;
	overflow: auto;
}

.whats{
  bottom: 20px;
	right: 15px;
  color: #ffffff;
  height: 50px;
  text-align: center;
  width: 50px;
  -webkit-transition-duration: 500ms;
  position: fixed;
  z-index: 9;
  opacity: .5;
}
.whats:hover{
  opacity: 1;
}