body {
    background-color: black;
    display: flex;
    flex-direction: column; 
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    margin: 0;
    overflow: hidden;
}

#case-display {
    width: 600px;
    height: 600px;
    margin-bottom: 30px; 
}

h1, h2 {
    color: green;
    text-align: center;
}

h1 {
    font-size: 300%;
    margin: 10px 0;
}

h2 {
    font-size: 200%;
    margin: 10px 0 30px 0; 
}

.button {
    background-color: green;
    border: none;
    color: white;
    padding: 15px 32px;
    text-align: center;
    text-decoration: none;
    font-size: 16px;
    cursor: pointer;
}