body, html {
    margin: 0;
    padding: 0;
    width: 100%;
    height: 100%;
    overflow: hidden;
}
#game-container {
    width: 100%;
    height: 100%;
}
.backbutton {
    position: fixed;
    top: 10px;
    left: 10px;
}
footer {
    text-align: center;
    background-color: #efefef;
    color: #000000;
    padding: 10px;
    font-size: 16px;
    position: absolute;
    left: 0;
    right: 0;
    bottom: 0;
    box-shadow: 0 0 12px #cccccc;
}
a {
    color: #007dcc;
    text-decoration: none;
    font-family: Arial;
}
a:hover {
    color: #016aad;
    text-decoration: underline;
    cursor: pointer;
}