fleet/frontend/components/top_nav/UserMenu/_styles.scss

.user-menu {
  button {
    background-color: transparent;
  }

  .dropdown-button__options {
    padding: $pad-small;
    right: 10px;
    margin-top: 2px;

    button {
      display: inline-block;
      min-width: 125px;

      &:hover {
        background-color: $ui-vibrant-blue-10;
        color: $core-fleet-black;
      }
    }

    .dropdown-button__option:last-child,
    .dropdown-button__option:nth-last-child(2) {
      border-top: 1px solid $ui-fleet-blue-15;
    }
  }
}