body {
    font-family: Arial, sans-serif;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    background-color: #f2f2f2;
    margin: 0;
    padding: 0;
}

.left {
    text-align: center;
    margin-right: 60px;
}

.timer {
    margin-bottom: 20px;
}

.button-group {
    display: flex;
    justify-content: center;
}

.button {
    padding: 15px 25px;
    text-align: center;
    text-decoration: none;
    display: inline-block;
    font-size: 20px;
    margin: 10px 2px;
    cursor: pointer;
    border-radius: 5px;
}

.green {
    background-color: #4CAF50;
    color: white;
    border: none;
}

.red {
    background-color: #f44336;
    color: white;
    border: none;
}

.right {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.box-row {
    display: flex;
    width: 100%;
    margin-top: 20px;
}

.box {
    width: 20vw;
    height: 20vw;
    max-height: 20vh;
    max-width: 20vh;
    margin: 5px;
    border: 1px solid black;
    display: flex;
    justify-content: center;
    align-items: center;
    font-weight: bold;
    font-size: 80px;
    border-radius: 10px;
}

.box-content {
    font-size: 80px;
}

.number-box {
    width: 20vw;
    height: 20vw;
    max-height: 20vh;
    max-width: 20vh;
    margin: 20px 0;
    border: 1px solid black;
    text-align: center;
    display: flex;
    justify-content: center;
    align-items: center;
    font-weight: bold;
    font-size: 40px;
    border-radius: 10px;
}

.refresh {
    background-color: #008CBA;
    color: white;
    border: none;
}

h1#timer {
    font-size: 96px;
    margin: 0;
}