body {
    font-family: sans-serif;
    text-align: center;
    margin: 0;
    padding: 20px;
}

h1 {
    margin-bottom: 30px;
}

.box {
    border: 2px solid #ccc;
    border-radius: 10px;
    padding: 30px;
    display: inline-block;
}

button {
    padding: 10px 20px;
    font-size: 16px;
    cursor: pointer;
}

#stage {
    width: 800px;
    height: 600px;
    margin: auto;
    border: 2px solid black;
    position: relative;
    overflow: hidden;
}