mdb-ui-kit/scss/_dropdown.scss

.dropdown-menu {
  border: 0;
  box-shadow: 0 2px 5px 0 rgba($black, 0.26);
  .divider {
    background-color: rgba(229, 229, 229, 0.12);
  }
  li {
    position: relative;
    overflow: hidden;
    a:hover {
      color: $brand-primary;
      background-color: transparent;
    }
  }
}