.inner_page_about {
    text-align: center;
    background: url(../img/school1.jpg) no-repeat center;
    background-size: cover;
    -webkit-background-size: cover;
    -moz-background-size: cover;
    -o-background-size: cover;
    -ms-background-size: cover;
    min-height: 250px;
}
@media(max-width:991px){
	.inner_page_about {
		min-height: 290px;
	}
}

@media(max-width:800px){
	.inner_page_about {
		min-height: 281px;
	}
}
@media(max-width:480px){
	.inner_page_about {
		min-height: 253px;
	}
}