div>section {
	max-width: 1200px;
	margin: 50px auto 0;
	padding: 0 10px
}
@media screen and (max-width:640px){
    .osusume.top{
        display: none;
    }
    .osusume.bottom{
        display: block;
    }
}
@media screen and (min-width:641px){
    .osusume.top{
        display: block;
    }
    .osusume.bottom{
        display: none;
    }
}