html,body {
    margin:0;
    height:100%

}

.sky {
    height:100%;
    background:#007fd5;
    position:relative;
    overflow:hidden;
    -webkit-animation:sky_background 50s ease-out infinite;
    -moz-animation:sky_background 50s ease-out infinite;
    -o-animation:sky_background 50s ease-out infinite;
    -webkit-transform:translate3d(0,0,0);
    -moz-transform:translate3d(0,0,0);
    -o-transform:translate3d(0,0,0)
}


.moon {
    background:url("images/moon.png");
    position:absolute;
    left:0;
    height:100%;
    width:450%;
    -webkit-animation:moon 50s linear infinite;
    -moz-animation:moon 50s linear infinite;
    -o-animation:moon 50s linear infinite;
    -webkit-transform:translate3d(0,0,0);
    -moz-transform:translate3d(0,0,0);
    -o-transform:translate3d(0,0,0)
}


.clouds_one {
    background:url("images/cloud_one.png");
    position:absolute;
    left:0;
    top:0;
    height:100%;
    width:450%;
    -webkit-animation:cloud_one 50s linear infinite;
    -moz-animation:cloud_one 50s linear infinite;
    -o-animation:cloud_one 50s linear infinite;
    -webkit-transform:translate3d(0,0,0);
    -moz-transform:translate3d(0,0,0);
    -o-transform:translate3d(0,0,0)
}

.clouds_two {
    background:url("images/cloud_two.png");
    position:absolute;
    left:0;
    top:0;
    height:100%;
    width:450%;
    -webkit-animation:cloud_two 75s linear infinite;
    -moz-animation:cloud_two 75s linear infinite;
    -o-animation:cloud_two 75s linear infinite;
    -webkit-transform:translate3d(0,0,0);
    -moz-transform:translate3d(0,0,0);
    -o-transform:translate3d(0,0,0)
}

.clouds_three {
    background:url("images/cloud_three.png");
    position:absolute;
    left:0;
    top:0;
    height:100%;
    width:450%;
    -webkit-animation:cloud_three 100s linear infinite;
    -moz-animation:cloud_three 100s linear infinite;
    -o-animation:cloud_three 100s linear infinite;
    -webkit-transform:translate3d(0,0,0);
    -moz-transform:translate3d(0,0,0);
    -o-transform:translate3d(0,0,0)
}

@-webkit-keyframes sky_background {
    0% {
        background:#007fd5;
        color:#007fd5
    }

    50% {
        background:#000;
        color:#a3d9ff
    }

    100% {
        background:#007fd5;
        color:#007fd5
    }
}

@-webkit-keyframes moon {
    0% {
        opacity: 0;
        left:-200%;
        -moz-transform: scale(0.5);
        -webkit-transform: scale(0.5);
    }

    50% {
        opacity: 1;
        -moz-transform: scale(1);
        left:0%;
        bottom:250px;
        -webkit-transform: scale(1);
    }

    100% {
        opacity: 0;
        bottom:500px;
        -moz-transform: scale(0.5);
        -webkit-transform: scale(0.5);
    }
}

@-webkit-keyframes cloud_one {
    0% {
        left:0
    }

    100% {
        left:-200%
    }
}

@-webkit-keyframes cloud_two {
    0% {
        left:0
    }

    100% {
        left:-200%
    }
}

@-webkit-keyframes cloud_three {
    0% {
        left:0
    }

    100% {
        left:-200%
    }
}

@-moz-keyframes sky_background {
    0% {
        background:#007fd5;
        color:#007fd5
    }

    50% {
        background:#000;
        color:#a3d9ff
    }

    100% {
        background:#007fd5;
        color:#007fd5
    }
}

@-moz-keyframes moon {
    0% {
        opacity: 0;
        left:-200%
            -moz-transform: scale(0.5);
        -webkit-transform: scale(0.5);
    }

    50% {
        opacity: 1;
        -moz-transform: scale(1);
        left:0%
            bottom:250px;
        -webkit-transform: scale(1);
    }

    100% {
        opacity: 0;
        bottom:500px;
        -moz-transform: scale(0.5);
        -webkit-transform: scale(0.5);
    }
}

@-moz-keyframes cloud_one {
    0% {
        left:0
    }

    100% {
        left:-200%
    }
}

@-moz-keyframes cloud_two {
    0% {
        left:0
    }

    100% {
        left:-200%
    }
}

@-moz-keyframes cloud_three {
    0% {
        left:0
    }

    100% {
        left:-200%
    }
}