body {
    width: 2500px;
    height: 1400px;
}

#main {
    float: left;
    width: 40%;
    height: 100%;
}

#side {
    width: 57%;
    height: 100%;
    margin-left: 3%;
    float: right;
}

#cy {
    width: 100%;
    height: 100%;
}