# Happy Holidays!
View Compiled
@snowsize: 450px;
@snowfall: 20s;

html {

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  height: 100%;
  position: relative;
  .background-size(@snowsize auto);
  .animation(snowing @snowfall linear infinite);
}

h1 {
  position: absolute;
  top: 50%;
  margin-top: -0.5em;

  width: 100%;
  line-height: 1em;
  text-align: center;
  
  font-size: 42px;
  font-weight: 300;
  letter-spacing: -0.025em;
  color: hsl(210, 20%, 35%);
  
  font-family: "HelveticaNeue-Light", "Helvetica Neue Light", "Helvetica Neue", Helvetica, Arial, "Lucida Grande", Sans-Serif;
}
  
// Animation
@-webkit-keyframes snowing {
  from { background-position-y: 0px, 0px; }
    to { background-position-y: (@snowsize * 2), @snowsize; }
}

@-moz-keyframes snowing {
  from { background-position-y: 0px, 0px; }
    to { background-position-y: (@snowsize * 2), @snowsize; }
}

@-ms-keyframes snowing {
  from { background-position-y: 0px, 0px; }
    to { background-position-y: (@snowsize * 2), @snowsize; }
}

@-o-keyframes snowing {
  from { background-position-y: 0px, 0px; }
    to { background-position-y: (@snowsize * 2), @snowsize; }
}

@keyframes snowing {
  from { background-position-y: 0px, 0px; }
    to { background-position-y: (@snowsize * 2), @snowsize; }
}

// Mixins
.animation(@settings) {
-webkit-animation: @settings;
   -moz-animation: @settings;
    -ms-animation: @settings;
     -o-animation: @settings;
        animation: @settings;
}
  
.background-size(@size) {
-webkit-background-size: @size;
   -moz-background-size: @size;
     -o-background-size: @size;
        background-size: @size;
}
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External CSS

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External JavaScript

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