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    Codepen by
    %a{ href: "https://twitter.com/gnclmorais"} gnclmorais
    Inspired by the folks at
    %a{ href: "http://quietkit.com/box-breathing/" } QuietKit
              /** Mixins */
  width (size)vmin
  height (size)vmin
  margin-top (size / -2)vmin
  margin-left (size / -2)vmin
  position absolute
  top 50%
  left 50%
  border-radius 50%

/** Animations */
@keyframes box-breath
  0%, 75%, 100%
    transform scale(.3)
  25%, 50%
    transform scale(1)

/** Single div box-breathing */
  border 5px solid slategrey
    content ''
    background lightskyblue
    animation box-breath (4s * 4) infinite

 /** About the idea */
  position absolute
  left 0
  right 0
  bottom 0
  font-family sans-serif
  color dimgrey
  padding 10px 15px
    color darkslategrey
    float right
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