:root {
    --bg-color: #ffffff;
    --text-color: #000000;
    --number-bg: #eeeeee;
    --button-bg: #f0f0f0;
    --button-text: #000000;
}

body.dark-mode {
    --bg-color: #121212;
    --text-color: #ffffff;
    --number-bg: #333333;
    --button-bg: #444444;
    --button-text: #ffffff;
}

body {
    font-family: sans-serif;
    display: flex;
    flex-direction: column;
    align-items: center;
    margin-top: 50px;
    background-color: var(--bg-color);
    color: var(--text-color);
    transition: background-color 0.3s, color 0.3s;
}

#theme-toggle {
    position: absolute;
    top: 20px;
    right: 20px;
}

#numbers-container {
    display: flex;
    margin-bottom: 20px;
}

.number {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background-color: var(--number-bg);
    display: flex;
    justify-content: center;
    align-items: center;
    margin: 0 5px;
    font-size: 20px;
    font-weight: bold;
    transition: background-color 0.3s;
}

button {
    padding: 10px 20px;
    font-size: 16px;
    cursor: pointer;
    background-color: var(--button-bg);
    color: var(--button-text);
    border: 1px solid #ccc;
    border-radius: 4px;
    transition: background-color 0.3s, color 0.3s;
}