.clouds {
    position: absolute;
    top: 0;
    left: 0;
    bottom: 0;
    right: 0;
    z-index: 1;
    pointer-events: none;
    overflow: hidden;

}

[class^="cloud-"] {
    position: absolute;
    right: 120%;
    width: 244px;
    height: 96px;
}

[class^="cloud-"]:before,
[class^="cloud-"]:after {
    content: '';
    position: absolute;
    top: -15px;
    left: 10px;
    width: 244px;
    height: 96px;
    background-image: url('../img/cloud2.png');
}

[class^="cloud-"]:after {
    top: -55px;
    left: auto;
    right: 15px;
    width: 244px;
    height: 96px;
}

.cloud-1 {
    top: 50px;
    -webkit-transform: scale(3);
    -moz-transform: scale(3);
    transform: scale(3);
    -webkit-animation: moveclouds 60s linear infinite;
    -moz-animation: moveclouds 60s linear infinite;
    -o-animation: moveclouds 60s linear infinite;
    animation: moveclouds 60s linear infinite;
}

.cloud-2 {
    top: 125px;
    opacity: 0.8;
    -webkit-transform: scale(2.8);
    -moz-transform: scale(2.8);
    transform: scale(2.8);
    -webkit-animation: moveclouds 60s linear infinite;
    -moz-animation: moveclouds 60s linear infinite;
    -o-animation: moveclouds 60s linear infinite;
    animation: moveclouds 60s linear infinite;
    -webkit-animation-delay: 5s;
    -moz-animation-delay: 5s;
    animation-delay: 5s;
}

.cloud-3 {
    top: 250px;
    opacity: 0.6;
    -webkit-transform: scale(2.6);
    -moz-transform: scale(2.6);
    transform: scale(2.6);
    -webkit-animation: moveclouds 40s linear infinite;
    -moz-animation: moveclouds 40s linear infinite;
    -o-animation: moveclouds 40s linear infinite;
    animation: moveclouds 40s linear infinite;
}

.cloud-4 {
    top: 300px;
    opacity: 0.75;
    -webkit-transform: scale(2.75);
    -moz-transform: scale(2.75);
    transform: scale(2.75);
    -webkit-animation: moveclouds 45s linear infinite;
    -moz-animation: moveclouds 45s linear infinite;
    -o-animation: moveclouds 45s linear infinite;
    animation: moveclouds 45s linear infinite;
    -webkit-animation-delay: 8s;
    -moz-animation-delay: 8s;
    animation-delay: 8s;
}

@-webkit-keyframes moveclouds {
    0%   { right: -20%; }
    100% { right: 120%; }
}
@-moz-keyframes moveclouds {
    0%   { right: -20%; }
    100% { right: 120%; }
}
@-o-keyframes moveclouds {
    0%   { right: -20%; }
    100% { right: 120%; }
}