#back{
	position: absolute;
	top: 50px;
    left: 70px;
}

#btn1{
	position: absolute;
	top: 130px;
    left: 250px;
	z-index: 99;
}
#btn2{
	position: absolute;
	top: 130px;
	left: 920px;
	z-index: 99;
}
#btn3{
	position: absolute;
	top: 460px;
	left: 250px;
	z-index: 99;
}
#btn4{
	position: absolute;
	top: 460px;
	left: 920px;
	z-index: 99;
}
.contentpop{
	position: absolute;
	top: 20px;
    left: 190px;
    color: white;
    font-size: 1.8em;
    text-align: left;
    width: 570px;
    height: 500px;
}