.rows_block{font-size:0px;margin:0px -6px;}
.rows_block:after, .rows_block:before {display: table;content: " ";}
.rows_block:after{clear:both;}
.rows_block *{box-sizing:border-box;-moz-box-sizing:border-box;-o-box-sizing:border-box;-webkit-box-sizing:border-box;}
.rows_block .item_block{display:inline-block;vertical-align:top;padding:6px 6px;}
.rows_block .col-80{width:80%;}
.rows_block .col-75{width:75%;}
.rows_block .col-66{width:66.66%;}
.rows_block .col-5{width:20%;}
.rows_block .col-4{width:25%;}
.rows_block .col-3{width:33.33%;}
.rows_block .col-2{width:50%;}
.rows_block .col-1{width:100%;}

@media (max-width:1100px){
     .rows_block .col-4{width:33%;}
}
@media all and (max-width: 770px){
    .rows_block .item_block{width: 50%;}
}
@media all and (max-width: 520px) {
    .rows_block .item_block{width: 100%;}
}