@media (max-width: 768px) {
  .box-item .box-content {
    padding: 20px; }
  .product_sample {
    margin-bottom: 30px; }
  .product_item {
    margin-bottom: 30px; }
  .footer {
    text-align: center;
    padding: 20px 0; }
    .footer .footer-links {
      text-align: center; }
  .navbar-toggle {
    margin-top: 20px; }
  .main-nav .navbar-nav > li > a {
    line-height: 20px; }
  .index_slider_wrapper .bx-wrapper {
    height: 250px; }
  .index_slider_wrapper .index_slider .slider_content {
    height: 250px; }
  .index_topic_box {
    margin-bottom: 50px; }
  .top_banner {
    height: 200px; } }