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              - raindrops = 30              #this needs to match the SASS

- #for each particle, create a particle div with a unique numbered class
- ( 1..raindrops ).each do |i|
    %div{:class => "raindrop raindrop--#{i}"}
              $particles:          30;        //this needs to match the HAML

//width/height of each raindrop
$raindropDim:        .5rem;
$animDuration:       2s;

html, body {
    height: 100%;
    background: black;

//particles- each is absolutely positioned
.raindrop {
    width: $raindropDim;
    height: $raindropDim;
    background: lightBlue;
    position: absolute;
    top: 0;
    left: 0;
    //Set animation to loop infinitely, with a linear timing function
    animation: $animDuration infinite anim-particle linear;
    border-radius: 999px;

//randomly set left position of each particle, and anim delay
@for $i from 1 through $particles {
    .raindrop--#{$i} {
        left: random() * 100%;
        animation-delay: -( random() * $animDuration );

//keyframes for a particle. Go from top to bottom
@keyframes anim-particle {
    0% {
        transform: translate( 0, 0 );
    100% {
        transform: translate( 0, 100vh );
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