.top{
    margin: 0;
    padding:0;
    position: fixed;
    top:0;
    left:0;
    height: 12%;
    width: 100%;
    background-image:url(../img/cloud_bg.png);
    background-size:contain;
    background-repeat:repeat-x;
}
.bot{
    margin: 0;
    padding:0;
    position: fixed;
    bottom:0;
    left:0;
    height: 12%;
    width: 100%;
    background-image:url(../img/cloud_bg2.png);
    background-size:contain;
    background-repeat:repeat-x;
    background-position-y:bottom;
}

.cloud{
    height:100%;
    position: absolute;

}