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

.container {
    text-align: center;
  padding: 10px;
}

.cell {
    text-align: center;
  padding: 10px;
}

.btn {
    margin-top: 20px;
    background-color: #4CAF50;
    color: white;
    padding: 10px 20px;
    font-size: 16px;
    cursor: pointer;
    border: none;
    border-radius: 5px;
}

.top-section {
    margin-bottom: 20px;
}

.bottom-section {
    position: relative;
}

#countdown {
    font-size: 24px;
    margin-top: 20px;
    position: absolute;
    bottom: 0;
    right: 0;
}
#restartBtn {
    display: none;
    margin-top: 20px;
    background-color: #4CAF50;
    color: white;
    padding: 10px 20px;
    font-size: 16px;
    cursor: pointer;
    border: none;
    border-radius: 5px;
}