sentry/static/less/dropdowns.less

.dropdown-menu {
  z-index: 1001;
  .dropdown-toggle,
  > li a {
    display: block;
    padding: 6px 10px;
  }
}

.dropdown-menu .dropdown-toggle {
  clear: both;
  font-weight: normal;
  line-height: 1.42857143;
  color: #493e54;
  white-space: nowrap;
}

.dropdown-submenu {
  position: relative;

  > span {
    display: block;

    > .dropdown-menu {
      &:after,
      &:before {
        display: none !important;
      }

      top: 0;
      left: 100%;
      margin-top: -5px;
      margin-left: -1px;
      -webkit-border-radius: 0 6px 6px 6px;
      -moz-border-radius: 0 6px 6px;
      border-radius: 0 6px 6px 6px;
    }
  }

  &.expand-left > span > .dropdown-menu {
    left: -100%;
    right: 100%;
    margin-left: 0;
    margin-right: -1px;
    border-radius: 6px 0 6px 6px;
  }

  &:hover > span {
    background: @white-darker;
    > a:after {
      border-left-color: #fff;
    }
  }
}