@media (max-width:640px){
.col1 {
	width: 300px;
	float: none;
}
.col2 {
    width: 300px;
    float: none;
    margin-top: 20px;
}
.col3 {
	width: 300px;
	float: none;
	margin-top: 20px;
}





}

@media (min-width:641px){
.col1 {
	width: 290px;
	min-height: 300px;
	float: left;
	margin-right: 40px;
}
.col2 {
	width: 490px;
	min-height: 300px;
	float: left;
}
.col3 {
	width: 300px;
	min-height: 300px;
	margin-left: 40px;
	float: left;
}








}