@mixin pin()
  position: fixed
  top: 0
  left: 0
  right: 0
  bottom: 0

/*
 * $size: all, top, right, bottom, left
 */
@mixin border($size: 1px, $color: black, $side: all)
  border: 0
  -webkit-appearance: none
  @if $side == 'all'
    box-shadow: inset 0 0 0 $size $color
  @else if $side == 'top'
    box-shadow: inset 0 $size 0 0 $color
  @else if $side == 'right'
    box-shadow: inset -#{$size} 0 0 0 $color
  @else if $side == 'left'
    box-shadow: inset $size 0 0 0 $color
  @else if $side == 'bottom'
    box-shadow: inset 0 -#{$size} 0 0 $color

@mixin animationRotate($speed: 1s)
  @keyframes animationRotate
      from
        transform: rotate(0)
      to
        transform: rotate(360deg)
  animation:
    name: animationRotate
    duration: $speed
    iteration-count: infinite
    timing-function: linear

@mixin animationPulse($speed: 1s, $size: 1rem, $color: black, $iteration: infinite)
  @keyframes animationPulse
      from
        box-shadow: 0 0 0 0 $color
      to
        box-shadow: 0 0 0 $size transparentize($color, 1)
  animation:
    name: animationPulse
    duration: $speed
    iteration-count: $iteration
    timing-function: linear