.zeppelin {
    width: 100%;
    z-index: 0;
}

/**
   * Clouds
   */

.clouds {
    bottom: 0;
    left: 0;
    overflow: hidden;
    position: relative;
    right: 0;
    top: 0;
    transform: translateZ(0);
}

.cloud {
    opacity: 1;
    position: absolute;
    right: 0;
    top: 20%;
    width: 300px;
}

.cloud.front { z-index: 1; }

.cloud.distant { z-index: -1; }

.cloud.background { z-index: 0; }

/*Cloud Sizing*/

.cloud.smaller {
    margin-right: 400px;
    margin-top: 50px;
    width: 100px;
}

.cloud.small {
    margin-right: 200px;
    width: 150px;
}

.cloud.big {
    margin-right: 150px;
    margin-top: 50px;
    width: 500px;
}

.cloud.massive {
    margin-right: 0px;
    margin-top: 20px;
    width: 600px;
}


/*Cloud: Animation*/

.cloud {
    -moz-animation-direction: reverse;
    -moz-animation-duration: 8s;
    -moz-animation-iteration-count: infinite;
    -moz-animation-name: cloud-movement;
    -moz-animation-timing-function: linear;

    -webkit-animation-direction: reverse;
    -webkit-animation-duration: 8s;
    -webkit-animation-iteration-count: infinite;
    -webkit-animation-name: cloud-movement;
    -webkit-animation-timing-function: linear;

    animation-direction: reverse;
    animation-duration: 8s;
    animation-iteration-count: infinite;
    animation-name: cloud-movement;
    animation-timing-function: linear;
}

.slow {
    -moz-animation-duration: 9.2s;
    -webkit-animation-duration: 9.2s;
    animation-duration: 9.2s;
}

.slower {
    -moz-animation-duration: 11.2s;
    -webkit-animation-duration: 11.2s;
    animation-duration: 11.2s;
}

.slowest {
    -moz-animation-duration: 13.5s;
    -webkit-animation-duration: 13.5s;
    animation-duration: 13.5s;
}

.super-slow {
    -moz-animation-duration: 20.5s;
    -webkit-animation-duration: 20.5s;
    animation-duration: 20.5s;
}

@-webkit-keyframes cloud-movement {
    0% {
        -moz-transform: translateX(300px);
        -webkit-transform: translateX(300px);
        opacity: 0.1;
        transform: translateX(300px);
    }

    10% { opacity: 0.7; }

    90% { opacity: 0; }

    100% {
        -moz-transform: translateX(-1000px);
        -webkit-transform: translateX(-1000px);
        opacity: 0;
        transform: translateX(-1000px);
    }
}