Pure CSS Drip

index.html

.drip

Pure CSS Drip.markdown

Pure CSS Drip

A CSS drip animation consisting of a single div.

A Pen by Peter Butcher on CodePen.

License.

style.css

// Animation properties
$anim-width:    200px;
$anim-height:   250px;
$anim-duration: 4s;

// Splash properties
$splash-width:  $anim-width;
$splash-height: $anim-width / 2;
$splash-origin: $splash-height / 2;
$water-level:   $splash-origin;

// Drip properties
$drip-size:     15px;
$drip-pos:      ($splash-width / 2) - ($drip-size / 2);
$drip-rebound:  40px;
$drip-re-size:  5px;
$drip-re-pos:   ($splash-width / 2) - ($drip-re-size / 2);

// Colours
$c-drip:        #FFF;
$c-splash:      #FFF;
$c-bg:          #43A2CE;

html, body {
  margin: 0;
  height: 100%;
  width: 100%;
  display: flex;
  background-color: $c-bg;
}

.drip {
  width: $anim-width;
  height: $anim-height;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  margin: auto;
  position: relative;

  &:before {
    position: absolute;
    left: $drip-pos;
    top: 0;
    content: '';
    width: $drip-size;
    height: $drip-size;
    background-color: $c-drip;
    border-radius: 50%;
    opacity: 0;
    animation: drip $anim-duration ease infinite;
  }

  &:after {
    box-sizing: border-box;
    position: absolute;
    bottom: 0;
    left: 0;
    content: '';
    width: 0px;
    height: 0px;
    border: solid 4px $c-drip;
    border-radius: 50%;
    opacity: 0;
    animation: splash $anim-duration ease infinite;
  }
}

@keyframes drip {
  10% {
    top: 0;
    opacity: 1;
    animation-timing-function: cubic-bezier(.24,0,.76,.14);
  }
  25% {
    opacity: 1;
    top: $anim-height - $water-level;
    animation-timing-function: ease-out;
    width: $drip-size;
    height: $drip-size;
    left: $drip-pos;
  }
  30% {
    opacity: 1;
    top: $anim-height - ($water-level + $drip-rebound);
    width: $drip-re-size;
    height: $drip-re-size;
    animation-timing-function: ease-in;
    left: $drip-re-pos;
  }
  33% {
    top: $anim-height - $water-level;
    opacity: 0;
    animation-timing-function: ease-out;
    left: $drip-re-pos;
  }
  33.001% {
    opacity: 0;
  }
  100% {
    opacity: 0;
  }
}

@keyframes splash {
  0% {
    opacity: 0;
  }
  25% {
    bottom: $splash-height / 2;
    left: $splash-width / 2;
    opacity: 0;
    width: 0px;
    height: 0px;
  }
  25.001% {
    opacity: 1;
  }
  33% {
    bottom: 0;
    left: 0;
    opacity: 0;
    width: $splash-width;
    height: $splash-height;
  }
  33.001% {
    bottom: $splash-height / 2;
    left: $splash-width / 2;
    opacity: 1;
    width: 0px;
    height: 0px;
  }
  43% {
    bottom: 0;
    left: 0;
    opacity: 0;
    width: $splash-width;
    height: $splash-height;
  }
  43.001% {
    opacity: 0;
  }
}