.option_flex{
            float: left;
            width: 33%;
        }
        
        div .icon {
            float: left;
            width: 16px;
            height: 16px;
            margin-right: 5px;
        }        
        div.width .icon {
            background: url(/image/icon_size.png) no-repeat 0px 0px;
        }        
        div.height .icon {
            background: url(/image/icon_size.png) no-repeat -16px 0px;
        }
        div.length .icon {
            background: url(/image/icon_size.png) no-repeat -32px 0px;
        }
        .is_main{
            width: 32px !important;
            height: 32px !important;
        }
        .is_main:checked:before {
            width: 32px !important;
            height: 32px !important;
            font-size: 24px !important;
            background-color: #ff5400 !important;
        }        
  
        .material_body{
            display: none;
            position: absolute;
            z-index: 1000;
            background: #fff;
            padding: 5px;
            border: 1px solid #ddd;
            width: 370px;
        }
        .material_header{
            /*cursor: pointer;*/
        }
        
@media screen and (max-width: 768px) {
    .us-product-quantity{
      margin-top: 40px;   
    }
}