Robot Piston Loader

HTML

<div id="robot">
    <div class="piston">
        <div class="rotator"></div>
        <div class="block">
            R
            <div class="arm"></div>
        </div>
    </div>
    <div class="piston_r">
        <div class="rotator"></div>
        <div class="block">
            O
            <div class="arm"></div>
        </div>
    </div>
    <div class="piston">
        <div class="rotator"></div>
        <div class="block">
            B
            <div class="arm"></div>
        </div>
    </div>
    <div class="piston">
        <div class="rotator"></div>
        <div class="block">
            O
            <div class="arm"></div>
        </div>
    </div>
    <div class="piston">
        <div class="rotator"></div>
        <div class="block">
            T
            <div class="arm"></div>
        </div>
    </div>
</div>

<link href='http://fonts.googleapis.com/css?family=Oswald:400,700' rel='stylesheet' type='text/css'>

CSS

@-webkit-keyframes piston {
    0% { margin-top: 0; }
    50% { margin-top: 80px; }
    100% { margin-top: 0; }
}
@keyframes piston {
    0% { margin-top: 0; }
    50% { margin-top: 80px; }
    100% { margin-top: 0; }
}
@-webkit-keyframes arm {
    0% { -webkit-transform: rotate(0); }
    25% { -webkit-transform: rotate(-18deg); }
    50% { -webkit-transform: rotate(0); }
    75% { -webkit-transform: rotate(18deg); }
    100% { -webkit-transform: rotate(0); }
}
@keyframes arm {
    0% { transform: rotate(0); }
    25% { transform: rotate(-18deg); }
    50% { transform: rotate(0); }
    75% { transform: rotate(18deg); }
    100% { transform: rotate(0); }
}

html {
    height: 100%;
}
body {
    margin: 60px 0 0;
    text-align: center;
    background: linear-gradient(to bottom, coral, tomato);
}

#robot {
    position: absolute;
    top:50%; left:50%;
    width: 540px;
    height: 250px;
    margin-top:-125px; margin-left:-270px;
    font-family: 'Oswald', sans-serif;
    font-size: 30px;
    font-weight: 700;
    color: #444;
    text-shadow: 0px -1px 1px rgba(0,0,0,.7), 0px 1px 1px rgba(255,255,255,.4);
}

.piston {
    float: left;
    margin-right: 10px;
    position: relative;
    width: 100px; 
    height: 250px;
    background: rgba(0,0,0,.1);
    border-radius: 10px 10px 50px 50px;
    box-shadow: 0 -4px 0 rgba(0,0,0,.2), 0 4px 0 rgba(255,255,255,.2);
}
.piston_r {
    float: left;
    margin-right: 10px;
    position: relative;
    width: 100px; 
    height: 50px;
    background: rgba(0,0,0,.1);
    border-radius: 10px 10px 50px 50px;
    box-shadow: 0 -4px 0 rgba(0,0,0,.2), 0 4px 0 rgba(255,255,255,.2);
}
.piston:last-child {
    margin: 0;
}

.piston .block {
    position: relative;
    width: 100px; 
    height: 60px;
    line-height: 60px;
    background: #555;
    border-radius: 10px;
    -webkit-animation: piston 1.2s cubic-bezier(.5,0,.5,1) infinite;
    animation: piston 1.2s cubic-bezier(.5,0,.5,1) infinite;
    box-shadow: inset 0 -4px 0...

JavaScript

// ROBOT PISTON LOADER //