@media screen and (max-width: 768px) {
    #main #tri-block {
        margin-top: 0px;
        height: 490px;  
    }

}
@media screen and (max-width: 568px) {
     #main #tri-block {
        height: auto;  
    }
}
@media screen and (max-width: 320px) {

    #main > #news-panel {
        height: 200px;
    }
    #main #tri-block {
        height: auto;
    }
}