.sky {
    height: 480px;
    position: absolute;
    left: -20px;
    top: 50px;
    width: 100%;
    z-index: 1;
}
.clouds_one {
    background: url("../images/clouds/cloud_one.png");
    position: absolute;
    left: 0;
    top: 0;
    height: 100%;
    width: 300%;
    -webkit-animation: cloud_one 50s linear infinite;
    -moz-animation: cloud_one 50s linear infinite;
    -o-animation: cloud_one 50s linear infinite;
    animation: cloud_one 50s linear infinite;
    -webkit-transform: translate3d(0, 0, 0);
    -ms-transform: translate3d(0, 0, 0);
    -o-transform: translate3d(0, 0, 0);
    transform: translate3d(0, 0, 0);
}

.clouds_one_static {
    background: url("../images/clouds/cloud_one.png");
    position: absolute;
    left: -20px;
    top: 50px;
    width: auto;
    z-index: 1;
    height: auto;
    -ms-filter: progid:DXImageTransform.Microsoft.Alpha(Opacity=30);
    filter: progid:DXImageTransform.Microsoft.Alpha(Opacity=30);
    opacity: .3;
}

.clouds_two {
    background: url("../images/clouds/cloud_two.png");
    position: absolute;
    left: 0;
    top: 0;
    height: 100%;
    width: 300%;
    -webkit-animation: cloud_two 75s linear infinite;
    -moz-animation: cloud_two 75s linear infinite;
    -o-animation: cloud_two 75s linear infinite;
    animation: cloud_two 75s linear infinite;
    -webkit-transform: translate3d(0, 0, 0);
    -ms-transform: translate3d(0, 0, 0);
    -o-transform: translate3d(0, 0, 0);
    transform: translate3d(0, 0, 0);
}

.clouds_three {
    background: url("../images/clouds/cloud_three.png");
    position: absolute;
    left: 0;
    top: 0;
    height: 100%;
    width: 300%;
    -webkit-animation: cloud_three 100s linear infinite;
    -moz-animation: cloud_three 100s linear infinite;
    -o-animation: cloud_three 100s linear infinite;
    animation: cloud_three 100s linear infinite;
    -webkit-transform: translate3d(0, 0, 0);
    -ms-transform: translate3d(0, 0, 0);
    -o-transform: translate3d(0, 0, 0);
    transform: translate3d(0, 0, 0);
}
@-webkit-keyframes cloud_one {
    0% {
        left: 0
    }
    100% {
        left: -200%
    }
}
@-moz-keyframes cloud_one {
    0% {
        left: 0
    }
    100% {
        left: -200%
    }
}
@keyframes cloud_one {
    0% {
        left: 0
    }
    100% {
        left: -200%
    }
}

@-webkit-keyframes cloud_two {
    0% {
        left: 0
    }
    100% {
        left: -200%
    }
}
@-moz-keyframes cloud_two {
    0% {
        left: 0
    }
    100% {
        left: -200%
    }
}
@keyframes cloud_two {
    0% {
        left: 0
    }
    100% {
        left: -200%
    }
}

@-webkit-keyframes cloud_three {
    0% {
        left: 0
    }
    100% {
        left: -200%
    }
}
@-moz-keyframes cloud_three {
    0% {
        left: 0
    }
    100% {
        left: -200%
    }
}
@keyframes cloud_three {
    0% {
        left: 0
    }
    100% {
        left: -200%
    }
}