@media screen and (min-width: 315px){
        #body_wrapper{width: 315px;}
    }
    @media screen and (min-width: 630px){
        #body_wrapper{width: 630px;}
    }
    @media screen and (min-width: 945px){
        #body_wrapper{width: 945px;}
    }
    @media screen and (min-width: 1260px){
        #body_wrapper{width: 1260px;}
    }
@media screen and (min-width: 315px){
    #img_container img{width: 300px}
    #img_container{width: 300px}
}
@media screen and (min-width: 630px){
    #img_container img{width: 300px}
    #img_container{width: 300px}
}
@media screen and (min-width: 945px){
    #img_container img{width: 300px}
    #img_container{width: 300px}
}
@media screen and (min-width: 1260px){
    #img_container img{width: 600px}
    #img_container{width: 600px}
}