* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    color: #eee;
    text-shadow: 0 -1px 0 rgba(0,0,0,.6);
    font-family: 'Open Sans', sans-serif;
    font-size: 13px;
    line-height: 16px;
    overflow: hidden;
}

#viewport {
    perspective: 1000px;
    position: absolute;
    inset: 0;
    overflow: hidden;
    background: linear-gradient(to top, rgb(69,132,180) 28%, rgb(31,71,120) 64%);
}

#world {
    position: absolute;
    left: 50%;
    top: 50%;
    width: 512px;
    height: 512px;
    margin-left: -256px;
    margin-top: -256px;
    transform-style: preserve-3d;
}

#world div {
    transform-style: preserve-3d;
}

.cloudBase {
    position: absolute;
    left: 256px;
    top: 256px;
    width: 20px;
    height: 20px;
    margin-left: -10px;
    margin-top: -10px;
}

.cloudLayer {
    position: absolute;
    left: 50%;
    top: 50%;
    width: 256px;
    height: 256px;
    margin-left: -128px;
    margin-top: -128px;
    transition: opacity 0.5s ease-out;
}

.cf-hidden {
    display: none;
}

.cf-invisible {
    visibility: hidden;
}