body, html {
    height: 100%;
    margin: 0;
    display: flex;
    justify-content: center;
    align-items: center;
    background-color: #f0f0f0;
}

.container {
    position: relative;
    text-align: center;
}

.content {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
}

.timer {
    font-size: 4rem;
    margin-bottom: 20px;
}

.timer-controls, .music-controls {
    display: flex;
    justify-content: center;
    margin-top: 20px;
}

.timer-controls button, .music-controls button {
    margin: 0 5px;
    padding: 10px 20px;
    font-size: 1rem;
    cursor: pointer;
    background-color: #4CAF50;
    color: white;
    border: none;
    border-radius: 5px;
    outline: none;
}

.timer-controls button:hover, .music-controls button:hover {
    background-color: #45a049;
}

/* Your existing CSS... */

.background {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-size: cover;
    background-position: center;
    z-index: -1;
}