body {
    font-family: Arial, sans-serif;
    background-color: #f9f9f9;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
}

.container {
    text-align: center;
    border: 1px solid #333;
    padding: 20px;
    background-color: white;
    border-radius: 5px;
    width: 420px;
}

h1 {
    font-size: 2em;
}

.circle {
    margin: 20px auto;
    width: 250px;
    height: 250px;
    background-color: red; /* Default color */
    border-radius: 50%;
    transition: background-color 0.3s ease;
}

.buttons button {
    margin: 5px;
    padding: 10px 15px;
    font-size: 1em;
    cursor: pointer;
    border: 1px solid #333;
    border-radius: 5px;
}