@media only screen and (min-width: 769px) and (max-width: 803px) {
    .first-col {min-height: 572px;max-height:572px;}
    .second-col {min-height: 572px;max-height:572px;}
    .last-col {min-height: 572px;max-height:572px;}
}

@media only screen and (min-width: 804px) and (max-width: 820px) {
    .first-col {min-height: 556px;max-height:556px;}
    .second-col {min-height: 556px;max-height:556px;}
    .last-col {min-height: 556px;max-height:556px;}
}
@media only screen and (min-width: 821px) and (max-width: 895px){
    .first-col {min-height: 530px;max-height:530px;}
    .two-third {min-height: 530px;max-height:530px;}
    .last-col {min-height: 530px;max-height:530px;}
}
@media only screen and (min-width: 896px) and (max-width: 1073px) {
    .first-col {min-height: 510px;}
    .second-col {min-height: 510px;}
    .last-col {min-height: 510px; max-height:510px;}
}
/*@media only screen and (min-width: 1074px){
    .first-col {min-height: 480px;}
    .second-col {min-height: 480px;}
    .last-col {min-height: 480px;max-height:460px;}
}*/