.main_content{
	position:relative;
	min-height:640px;
}

#speaker{
	cursor:pointer;
}

#alpha {
	clear:both;
}

#alpha canvas{
	cursor: pointer;
	margin: 5px;
	opacity:0.7;
	float:left;
}

#alpha canvas:hover{
    opacity:1;
} 

#alpha_type{
	clear:both;
}

.icon-speaker:before{
	font-size:50px;
	margin-left:20px;
}