body {
    font-family: Arial, sans-serif;
    text-align: center;
    transition: 0.3s;
}

.center {
    margin-top: 15%;
}

.day {
    background: white;
    color: black;
}

.night {
    background: black;
    color: white;
}

.mode-btn {
    padding: 10px 20px;
    font-size: 16px;
    background: rgb(90, 70, 150);
    color: white;
    border: none;
    border-radius: 8px;
    cursor: pointer;
}

.mode-btn:hover {
    transform: scale(1.05);
}