arrow()
  display inline-block
  vertical-align middle
  width 1em
  height 1em
  background-image url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'%3E%3Cpath fill='rgba(0,0,0,0.5)' d='M7.41 15.41L12 10.83l4.59 4.58L18 14l-6-6-6 6z'/%3E%3C/svg%3E")
  line-height normal
  transition all 0.3s

  .theme-dark &
    background-image url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'%3E%3Cpath fill='rgba(255,255,255,0.5)' d='M7.41 15.41L12 10.83l4.59 4.58L18 14l-6-6-6 6z'/%3E%3C/svg%3E")

  &.down
    transform rotate(180deg)

  &.right
    transform rotate(90deg)

  &.left
    transform rotate(-90deg)