.activity-3 .ac1-main-container {
	margin: 0 auto;
	-webkit-overflow-scrolling: touch;
}
.activity-3{
	position: relative;
	height: 100%;
	width: 100%;
	overflow: hidden;
}
.activity-3 .videoPlayWrapper{
    position: absolute;
    top: 0px;
    left:0px;
    width: 540px;
    height: 280px;
    background-color: rgba(225,225,225,0.5);
	display: none;
}


.activity-3 .screenParent{
	position: relative;
	margin: 0 auto;
	width: 100%;
	height: 100%;
}


.activity-3 .button_container{
	position: absolute;
	top: 180px;
	left: 33px;
	display:block;

}

.activity-3 .buttonBox{
	position: absolute;
	width:308px;
	height:170px;
	cursor:pointer;
	color:#fff;

}
.activity-3 #volcanic_island_arc_btn{
	left:0px;
	top:0px
}

.activity-3 #continental_volcanic_arc_btn{
	left:325px;
	top:0px
}

.activity-3 #continental_collision_btn{
	left:647px;
	top:0px
}