@media (max-width: 991px) {
  .navbar-header {
    float: none;
  }
  .navbar-toggle {
    display: block;
  }
  .navbar-collapse {
    border-top: 1px solid transparent;
    box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.1);
  }
  .navbar-collapse.collapse {
    display: none !important;
  }
  .navbar-nav {
    float: none !important;
    margin: 7.5px -15px;
  }
  .navbar-nav > li {
    float: none;
  }
  .navbar-nav > li > a {
    padding-top: 10px;
    padding-bottom: 10px;
  }
  .navbar-text {
    float: none;
    margin: 15px 0;
  }
  /* since 3.1.0 */
  .navbar-collapse.collapse.in {
    display: block !important;
  }
  .collapsing {
    overflow: hidden !important;
  }

  .popover {
    margin: 0px auto;
    left: 0px !important;
    right: 0px !important ;
    text-align: center;
  }
}