body {
    background-color: #222;
    color: #eee;
    font-family: Arial, sans-serif;
    text-align: center;
}
#gameCanvas {
    background-color: #555;
    display: block;
    margin: 20px auto;
    border: 2px solid #eee;
}
.upload-section {
    margin: 20px;
}
.upload-section input[type="file"] {
    display: none;
}
.upload-section label {
    background-color: #444;
    padding: 10px 20px;
    border: 1px solid #eee;
    cursor: pointer;
    margin: 5px;
    display: inline-block;
}
.upload-section label:hover {
    background-color: #666;
}
.upload-action {
    margin-bottom: 10px;
}