@media only screen and (max-width: 520px) {
    .symple-one-half, .symple-one-third, .symple-two-third, .symple-three-fourth, .symple-one-fourth, .symple-one-fifth, .symple-two-fifth,.symple-three-fifth, .symple-four-fifth, .symple-one-sixth, .symple-five-sixth {
        width: 100%;
        float: none;
        margin-right: 0;
        margin-bottom: 20px;
    }
    .symple-pricing-table > div{
        margin-bottom: 25px;
    }
    .symple-box,
         .symple-box.left,
         .symple-box.right{
         float: none;
         width: 100% !important;
    }
    .symple-tabs ul.ui-tabs-nav li {
        width: 100%;
    }
}