.woocommerce-tabs-collapse .tab-header {
    background: #f4f4f4;
    border: 1px solid #ddd;
    padding: 10px;
    cursor: pointer;
    width: 100%;
    text-align: left;
}

.woocommerce-tabs-collapse .tab-content {
    background: #fff;
    border: 1px solid #ddd;
    padding: 15px;
    margin-top: -1px;
}