.product-info-main .product-options-wrapper,
.product-info-main .product-options-bottom {
    display: block;
    width: 100%;
    clear: both;
    float: none;
}

.product-info-main .product-options-wrapper {
    margin-bottom: 30px;
    padding-bottom: 15px;
}

.product-info-main .product-options-bottom {
    margin-top: 30px;
    padding-top: 15px;
}