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HTML 

              
                <div class="bg"></div>

<div class="ramp"></div>
 
<div class="clouds">
    <div class="cloud cA"></div>
    <div class="cloud cB"></div>
    <div class="cloud cC"></div> 
    <div class="cloud cD"></div> 
</div>

<div class="flipWrapper">
    <div class="radBike">
        <div class="crankset crankset1"> 
            <div class="crank crank-front">
                <div class="pedal pedal-left"></div>
            </div>
            <div class="sprocket"></div>
        </div>
        <div class="crankset crankset2">
            <div class="crank crankBack">
            </div>
            <div class="pedal pedal-right"></div>
        </div>
        <div class="bar bar-vertLeft"></div>
        <div class="bar bar-topLeft"></div>
        <div class="bar bar-bottomLeft"></div>
        <div class="bar bar-topCenter"></div>
        <div class="bar bar-bottomCenter"></div>
        <div class="bar bar-vertRight"></div>
        <div class="bar bar-handleTop2"></div>
        <div class="bar bar-handleTop"></div>
        <div class="bar bar-handleRight"></div>
        <div class="bar bar-handleBottom"></div>
        <div class="seat2"></div>
        <div class="seat"></div>
        <div class="tire tire-front">
            <div class="hub"></div>
            <div class="wheel">
                <hr class="spoke0">
                <hr class="spoke1">
                <hr class="spoke2">
                <hr class="spoke3">
                <hr class="spoke4">
                <hr class="spoke5">
                <hr class="spoke6">
                <hr class="spoke7">
                <hr class="spoke8">
            </div>
        </div>
        <div class="chains">
            <div class="chains-top"></div>
            <div class="chains-bottom"></div>
        </div>
        <div class="tire tire-back">
            <div class="hub"></div>
            <div class="wheel">
                <hr class="spoke0">
                <hr class="spoke1">
                <hr class="spoke2">
                <hr class="spoke3">
                <hr class="spoke4">
                <hr class="spoke5">
                <hr class="spoke6">
                <hr class="spoke7">
                <hr class="spoke8">
            </div>
        </div>
    </div>
</div>
!

CSS 

              
                body {
    background: #6c5838;
    background: -webkit-gradient( linear, left top, left bottom, color-stop(65%, #4da000), color-stop(88%, #905f0c), to(#905f0c));
    height: 100vh;
    position: relative;
    overflow: hidden;
}

.bg {
    background: -webkit-linear-gradient( #2a5b8e, #b2d8ff);
    height: 705px;
    overflow: hidden;
    position: relative;
    z-index:0;
}  

.ramp {
    position: absolute;
    width: 0;
    height: 0;
    border-style: solid;
    border-width: 0 80px 80px 160px;
    border-color: transparent transparent #795921 transparent;
    animation: first-rock 30s infinite;
    left: 0;
    top: 630px;
    -webkit-animation: ramp 3s 0s Infinite forwards ease-in;
    animation: ramp 3s 0s Infinite forwards ease-in;
}

.ramp:before {
    content: '';
    position: absolute;
    left: -30px;
    top: 35px;
    width: 0;
    height: 0;
    border-style: solid;
    border-width: 0 20px 40px 60px;
    border-color: transparent transparent #6f4f16 transparent;
    -webkit-transform: rotate(-135deg);
    transform: rotate(-135deg);
}
.ramp:after {
    content: '';
    position: absolute;
    left: -70px;
    top: 40px;
    width: 0;
    height: 0;
    border-style: solid;
    border-width: 0 10px 20px 60px;
    border-color: transparent transparent #6f4f16 transparent;
    -webkit-transform: rotate(-5deg);
    transform: rotate(-5deg);
}

.flipWrapper {
    position: absolute;
    z-index: 2;
    top: 0;
    left: 0;
    -webkit-animation: bounce 2s infinite;
    animation: bounce 1s infinite;
    -webkit-transition: all 300ms cubic-bezier(0.175, 0.885, 0.32, 1.275);
    transition: all 300ms cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

.radBike {
    position: absolute;
    left: 200px;
    top: 508px;
    width: 650px;
    -webkit-transform-origin: 70% 100%;
            transform-origin: 70% 100%;
    -webkit-animation: rotate 3s 2.1s Infinite ease-in-out;
    animation: rotate 3s 2.1s Infinite ease-in;
    -webkit-transition: all 300ms cubic-bezier(0.175, 0.885, 0.32, 1.275);
    transition: all 300ms cubic-bezier(0.175, 0.885, 0.32, 1.275);
    z-index: 3;
}

.seat {
    height: 18px;
    left: 180px;
    position: absolute;
    top: -95px;
    width: 80px;
    background: #000000;
    border-top-left-radius: 80px;
    border-top-right-radius: 250px;
    border-bottom-right-radius: 80px;
    border-bottom-left-radius: 190px;
    z-index: 6;
    -webkit-transform: rotate(10deg);
    transform: rotate(10deg);
    background: -webkit-gradient(linear, left top, left bottom, from(#4f4e4e), to(#000000));
}

.seat2 {
    position: absolute;
    height: 20px;
    left: 173px;
    top: -99px;    
    width: 60px;
    background: #000000;
    z-index: 5;
    border-radius: 80px;
    -webkit-transform: rotate(17deg);
    transform: rotate(17deg);
    background: -webkit-gradient(linear, left top, left bottom, from(#4f4e4e), to(#000000));
}

.seat2:after {
    content: "";
    width: 14px;
    height: 10px;
    border-bottom-left-radius: 10px;
    border-bottom-right-radius: 10px;
    -webkit-box-shadow: 0 0 2px 2px #fff, 0 0 0px 3px rgba(0, 0, 0, .7);
            box-shadow: 0 0 2px 2px #fff, 0 0 0px 3px rgba(0, 0, 0, .7);
    display: block;
    position: absolute;
    left: 29px;
    top: 13px;
}

.bar {
    position: absolute;
    background: #59753d;
    z-index: 6;
    height: 10px;
    border-radius: 10px;
    background: -webkit-gradient(linear, left top, left bottom, from(#6e914d), to(#334323));
}

.bar-topLeft {
    left: 110px;
    top: 104px;
    width: 180px;
    -webkit-transform-origin: left center;
    transform-origin: left center;
    -webkit-transform: rotate(-40deg);
    transform: rotate(-40deg);
}

.bar-bottomLeft {
    left: 109px;
    top: 102px;
    width: 180px;
}

.bar-vertLeft {
    left: 217px;
    top: -91px;
    width: 210px;
    -webkit-transform-origin: left center;
    transform-origin: left center;
    -webkit-transform: rotate(70deg);
    transform: rotate(70deg);
}

.bar-vertLeft:after {
    content: "";
height: 10px;
    width: 68px;
    top: 0px;
    right: 4px;
    position: relative;
    display: block;
    background: #fff;
    background: -webkit-linear-gradient(top, #fff, #828282);
    -webkit-box-shadow: inset 15px 0px 5px 0px rgba(0, 0, 0, 0.22);
            box-shadow: inset 15px 0px 5px 0px rgba(0, 0, 0, 0.22);
    border-right: 5px solid #444;
}

.bar-vertLeft:before {
    content: "";
    height: 8px;
    width: 8px;
    border-radius: 10px;
    top: 10px;
    right: 139px;
    z-index: 2;
    position: absolute;
    display: block;
    background: #2a3333;
}

.bar-vertRight {
    left: 452px;
    top: -92px;
    width: 210px;
    -webkit-transform-origin: left center;
    transform-origin: left center;
    -webkit-transform: rotate(70deg);
    transform: rotate(70deg);
}

.bar-topCenter {
    left: 241px;
    top: -7px;
    width: 230px;
    -webkit-transform-origin: left center;
    transform-origin: left center;
    -webkit-transform: rotate(-13deg);
    transform: rotate(-13deg);
}

.bar-topCenter:after {
    content:"";
    display: block;
    position: absolute;
    left: 18px;
    top: 27px;
    width: 80px;
    height: 45px;
    border-top-right-radius: 40px;
    border-bottom-right-radius: 40px;
    -webkit-box-shadow: inset 0 0 2px 4px #444, inset 0 0 0px 6px rgba(0, 0, 0, 1);
            box-shadow: inset 0 0 2px 4px #444, inset 0 0 0px 6px rgba(0, 0, 0, 1);
    -webkit-transform-origin: left center;
    transform-origin: left center;
    -webkit-transform: rotate(-8deg);
    transform: rotate(-8deg);
}

.bar-topCenter:before {
    content:"";
    display: block;
    position: absolute;
    z-index: 1;
    left: 18px;
    top: 24px;
    width: 8px;
    height: 50px;
    border-radius: 6px;
    background: -webkit-gradient(linear, left top, left bottom, from(left), color-stop(#4f4e4e), to(#000000));
    -webkit-transform-origin: left center;
    transform-origin: left center;
    -webkit-transform: rotate(-8deg);
    transform: rotate(-8deg);
}

.bar-bottomCenter {
    left: 286px;
    top: 103px;
    width: 230px;
    -webkit-transform-origin: left center;
    transform-origin: left center;
    -webkit-transform: rotate(-35deg);
    transform: rotate(-35deg);
}

.bar-bottomCenter:before {    
    content: "";
    display: block;
    position: absolute;
    z-index: 1;
    left: 20px;
    top: -52px;
    width: 11px;
    height: 20px;
    background: #000;
    -webkit-transform: rotate(14deg);
    transform: rotate(14deg);
    border-bottom-right-radius: 6px;
    background: -webkit-gradient(linear, left top, right top, from(#333), to(#000000));
}

.bar-handleTop {
    left: 449px;
    top: -87px;
    width: 60px;
    background-color: #000;
    -webkit-transform-origin: left center;
    transform-origin: left center;
    -webkit-transform: rotate(-20deg);
    transform: rotate(-20deg);
    background: -webkit-linear-gradient(top, #eee, #999);
}

.bar-handleTop2 {
    left: 442px;
    top: -78px;
    width: 28px;
    background-color: #000;
    -webkit-transform: rotate(70deg);
    transform: rotate(70deg);
    background: -webkit-gradient(linear, left top, left bottom, from(top), color-stop(#aaaaaa), to(#eeeeee));
    border-radius: 0;
    border-right: 3px solid #444;
}

.bar-handleRight {
    left: 500px;
    top: -110px;
    width: 40px;
    background-color: #000;
    -webkit-transform-origin: left center;
    transform-origin: left center;
    -webkit-transform: rotate(40deg);
    transform: rotate(40deg);
    background: -webkit-gradient(linear, left top, left bottom, from(#4f4e4e), to(#000000));
}

.bar-handleBottom {
    left: 508px;
    top: -70px;
    width: 30px;
    background-color: #000;
    -webkit-transform-origin: left center;
    transform-origin: left center;
    -webkit-transform: rotate(-40deg);
    transform: rotate(-40deg);
    background: -webkit-gradient(linear, left top, left bottom, from(#4f4e4e), to(#000000));
}

.tire {
    text-align: center;
    width: 210px;
    overflow: hidden;
    position: absolute;
    -webkit-animation: spin 3s linear infinite;
    animation: spin 3s linear infinite;
}

.tire-back {
    left: 10px;
    top: 7px;
}

.tire-front {
    left: 417px;
    top: 7px;
}

.hub {
    position: absolute;
    height: 30px;
    width: 30px;
    margin-left: -15px;
    margin-top: -15px;
    z-index: 4;
    left: 50%;
    top: 50%;
    border-radius: 50%;
    -webkit-box-sizing: border-box;
    box-sizing: border-box;
    background: #a7a7a7;
    border: 3px solid #313131;
    -webkit-box-shadow: inset 0 0 10px #444;
            box-shadow: inset 0 0 10px #444;
}

.sprocket {
    position: absolute;
    border-radius: 50%;
    background: transparent;
    -webkit-box-shadow: inset 0 0 0 5px #b7b7b7;
            box-shadow: inset 0 0 0 5px #b7b7b7;
    border: 1px solid #333;
    height: 70px;
    width: 70px;
    z-index: 2;
    left: 50%;
    top: 50%;
    margin-left: -35px;
    margin-top: -35px;
}

.sprocket:before {
    content: "";
    display: block;
    -webkit-transform-origin: center;
            transform-origin: center;
    -webkit-transform: rotate(45deg);
            transform: rotate(45deg);
    width: 100%;
    height: 6px;
    background: #b7b7b7;
    position: absolute;
/*     left: 2px; */
    top: 50%;
    margin-top: -3px;
}

.sprocket:after {
    content: "";
    display: block;
    -webkit-transform-origin: center;
    transform-origin: center;
    -webkit-transform: rotate(-45deg);
    transform: rotate(-45deg);
    width: 95%;
    height: 6px;
    background: #b7b7b7;
    position: absolute;
    left: 1px;
    top: 50%;
    margin-top: -2px;
}

.chains>* {
    height: 0;
    width: 180px;
    border-bottom: 2px solid #333;
    background: #000000;
    position: absolute;
    z-index: -1
}

.chains-top {
    top: 86px;
    left: 117px;
    -webkit-transform: rotate(-5deg);
    transform: rotate(-5deg);
}

.chains-bottom {
    top: 130px;
    left: 113px;
    -webkit-transform: rotate(8deg);
    transform: rotate(8deg);
}

.crankset {
    position: absolute;
    left: 190px;
    top: 10px;
    width: 200px;
    height: 200px;
    -webkit-animation: spin 2s linear infinite;
            animation: spin 2s linear infinite;
    -webkit-transform-origin: 51% 51%;
            transform-origin: 51% 51%;
}

.crankset1 {
    z-index: 10;
}

.crankset2 {
    z-index: 1;
}

.crank {
    position: absolute;
    height: 8px;
    width: 60px;
    left: 52%;
    top: 49%;
    background: #999999;
    -webkit-transform-origin: 0 center;
            transform-origin: 0 center;
    background: -webkit-gradient(linear, left top, left bottom, from(#aaaaaa), to(#eeeeee));
    border-radius: 6px;
    z-index: 3;
}

.crank-front {
    z-index: 3;
    -webkit-transform: rotate(180deg);
    transform: rotate(180deg);
    position: relative;
}

.crankset1:after {
    content: "";
    position: absolute;
    display: block;
    width: 30px;
    height: 30px;
    border-radius: 100%;
    background: #b7b7b7;
    background: radial-gradient(ellipse at center, rgb(162, 162, 162) 0%, rgb(162, 162, 162) 40%, rgb(193, 193, 193) 40%, rgb(193, 193, 193) 100%);
    z-index: 2;
    left: 50%;
    top: 50%;
    margin-left: -14px;
    margin-top: -13px;
    -webkit-box-shadow: 0 0 4px 1px #555;
            box-shadow: 0 0 4px 1px #555;
}

.crank-back {
    z-index: 1;
}

.pedal {
    width: 30px;
    height: 12px;
    background: rgb(34, 33, 33);
    border-radius: 3px;
}

.pedal-left {
    position: absolute;
    right: -10px;
    top: 0;
    -webkit-transform: rotate(180deg);
    transform: rotate(180deg);
    -webkit-animation: counter-spin 3s linear infinite;
    animation: counter-spin 3s linear infinite;
}

.pedal-right {
    position: absolute;
    /* right: -10px; */
    top: 50%;
    left: 75%;
    margin-left: -3px;
    margin-top: -3px;
    transform: translate(-6px -15px);
    -webkit-transform: rotate(180deg);
    transform: rotate(180deg);
    -webkit-animation: counter-spin 3s linear infinite;
    animation: counter-spin 3s linear infinite;
}

.wheel {
    border-radius: 50%;
    height: 195px;
    margin: 0 auto;
    position: relative;
    width: 195px;
    -webkit-box-shadow: inset 0 0 8px 5px #676767, inset 0 0 0px 17px rgba(0, 0, 0, 0.9), inset 0 0 0px 23px #efefef;
}

.wheel hr {
    position: absolute;
    border: none;
    top: 50%;
    margin: 0 auto;
    -webkit-transform: translateY(-50%);
            transform: translateY(-50%);
    z-index: -1;
    left: 0;
    display: block;
    width: 100%;
    border-top: 1px solid rgba(0, 0, 0, .2);
}

.wheel .spoke1 {
    -webkit-transform: rotate(20deg);
            transform: rotate(20deg);
}

.wheel .spoke2 {
    -webkit-transform: rotate(40deg);
            transform: rotate(40deg);
}

.wheel .spoke3 {
    -webkit-transform: rotate(60deg);
            transform: rotate(60deg);
}

.wheel .spoke4 {
    -webkit-transform: rotate(80deg);
            transform: rotate(80deg);
}

.wheel .spoke5 {
    -webkit-transform: rotate(100deg);
            transform: rotate(100deg);
}

.wheel .spoke6 {
    -webkit-transform: rotate(120deg);
            transform: rotate(120deg);
}

.wheel .spoke7 {
    -webkit-transform: rotate(140deg);
            transform: rotate(140deg);
}

.wheel .spoke8 {
    -webkit-transform: rotate(160deg);
            transform: rotate(160deg);
}

@-webkit-keyframes spin {
    100% {
        -webkit-transform: rotate(360deg);
                transform: rotate(360deg);
    }
}

@keyframes spin {
    100% {
        -webkit-transform: rotate(360deg);
                transform: rotate(360deg);
    }
}

@-webkit-keyframes counter-spin {
    100% {
        -webkit-transform: rotate(-360deg);
                transform: rotate(-360deg);
    }
}

@keyframes counter-spin {
    100% {
        -webkit-transform: rotate(-360deg);
                transform: rotate(-360deg);
    }
}

@-webkit-keyframes rotate {
    0% {
        top: 508px;
        -webkit-transform: rotate(0deg);
        transform: rotate(0deg);
    }
    25% {
        top: -200px;
    }
    60% {
        top: 508px;
        -webkit-transform: rotate(-360deg);
        transform: rotate(-360deg);
    }
    100% {
        top: 508px;
        -webkit-transform: rotate(-360deg);
        Transform: rotate(-360deg);
    }
}

@keyframes rotate {
    0% {
        top: 508px;
        -webkit-transform: rotate(0deg);
        transform: rotate(0deg);
    }
    25% {
        top: -200px;
    }
    60% {
        top: 508px;
        -webkit-transform: rotate(-360deg);
        transform: rotate(-360deg);
    }
    100% {
        top: 508px;
        -webkit-transform: rotate(-360deg);
        Transform: rotate(-360deg);
    }
}

@-webkit-keyframes bounce {
    0% {
        -webkit-transform: translate(0px, 0px) scaleY(1);
                transform: translate(0px, 0px) scaleY(1);
    }
    60% {
        -webkit-transform: translate(0px, -4px) scaleY(.99);
                transform: translate(0px, -4px) scaleY(.99);
    }
    90% {
        -webkit-transform: translate(0px, 0px) scaleY(1);
                transform: translate(0px, 0px) scaleY(1);
    }
    100% {
        -webkit-transform: translate(0px, 0px) scaleY(1);
                transform: translate(0px, 0px) scaleY(1);
    }
}

@keyframes bounce {
    0% {
        -webkit-transform: translate(0px, 0px) scaleY(1);
                transform: translate(0px, 0px) scaleY(1);
    }
    60% {
        -webkit-transform: translate(0px, -4px) scaleY(.99);
                transform: translate(0px, -4px) scaleY(.99);
    }
    90% {
        -webkit-transform: translate(0px, 0px) scaleY(1);
                transform: translate(0px, 0px) scaleY(1);
    }
    100% {
        -webkit-transform: translate(0px, 0px) scaleY(1);
                transform: translate(0px, 0px) scaleY(1);
    }
}

@-webkit-keyframes ramp {
    0% {
        left: 2000px;
    }
    100% {
        left: -200px;
    }
}

@keyframes ramp {
    0% {
        left: 2000px;
    }
    100% {
        left: -200px;
    }
}








/* =====================
         Clouds
===================== */

.clouds {
    top: 100px;
    right: -50%;
    position: absolute;
    opacity: .5;
}

.cloud {
    width: 200px;
    height: 60px;
    background: rgba(255, 255, 255, 1);
    border-radius: 200px;
    -moz-border-radius: 200px;
    -webkit-border-radius: 200px;
    position: absolute;
}

.cloud:before,
.cloud:after {
    content: '';
    position: absolute;
    background: rgba(255, 255, 255, 1);
    width: 100px;
    height: 80px;
    position: absolute;
    top: -15px;
    left: 10px;
    border-radius: 100px;
    -webkit-transform: rotate(30deg);
    transform: rotate(30deg);
}

.cloud:after {
    width: 120px;
    height: 120px;
    top: -60px;
    left: auto;
    right: 15px;
}

.cA {
    top: 130px;
    right: -160px;
    -webkit-animation: move 60s linear infinite;
    animation: move 60s linear infinite;
}

.cB {
    top: -30px;
    right: 550px;
    opacity: 0.6;
    -webkit-animation: move 50s linear infinite;
    animation: move 50s linear infinite;
}

.cC {
    right: 0px;
    top: 50px;
    opacity: 0.8;
    -webkit-animation: move 40s linear infinite;
    animation: move 40s linear infinite
}

.cD {
    right: -870px;
    top: -50px;
    opacity: 0.75;
    -webkit-animation: move 30s linear infinite;
    animation: move 30s linear infinite;
}


@-webkit-keyframes move {
    0% {
        -webkit-transform: translateX(-100vw);
        transform: translateX(-100vw);
        opacity: 0;
    }
    20% {
        opacity: 1;
    }
    90% {
        opacity: 1;
    }
    100% {
        -webkit-transform: translateX(-200vw);
        transform: translateX(-200vw);
        opacity: 0;
    }
}

@keyframes move {
    0% {
        -webkit-transform: translateX(-100vw);
        transform: translateX(-100vw);
        opacity: 0;
    }
    20% {
        opacity: 1;
    }
    90% {
        opacity: 1;
    }
    100% {
        -webkit-transform: translateX(-200vw);
        transform: translateX(-200vw);
        opacity: 0;
    }
}
!

JS 

              
                // nothing to see here folks
!
999px

Console