body {
    background-color: #212121;
    font-family: Arial, sans-serif;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
}

.container {
    background-color: #403b3b;
    padding: 20px;
    border-radius: 10px;
    text-align: center;
    max-width: 400px;
    width: 90%;
    margin: 0 auto;
}

h1 {
    color: #ff9800;
    margin-bottom: 20px;
    font-size: 1.5rem;
}

.progress-bar {
    width: 100%;
    height: 20px;
    background-color: #424242;
    border-radius: 10px;
    margin-bottom: 20px;
}

.progress {
    width: 25%;
    height: 100%;
    background-color: #ff9800;
    border-radius: 10px;
}

.button-group {
    display: flex;
    justify-content: center;
    gap: 10px;
    margin-bottom: 20px;
}

.activity-btn {
    background-color: #ff9800;
    color: white;
    border: none;
    padding: 10px 20px;
    text-align: center;
    text-decoration: none;
    font-size: 1rem;
    border-radius: 5px;
    cursor: pointer;
    flex: 1;
}