:root {
    --bg-color: #f0f0f0;
    --text-color: #333;
    --border-color: #ccc;
    --button-bg: #007bff;
    --button-color: #fff;
}

body.dark-mode {
    --bg-color: #2c2c2c;
    --text-color: #f0f0f0;
    --border-color: #555;
    --button-bg: #444;
    --button-color: #f0f0f0;
}

body {
    font-family: sans-serif;
    display: flex;
    flex-direction: column; /* Changed to column to allow button to be placed above */
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    background-color: var(--bg-color);
    color: var(--text-color);
    transition: background-color 0.3s, color 0.3s;
}

.theme-toggle {
    margin-bottom: 20px; /* Space between toggle and container */
    padding: 8px 15px;
    font-size: 14px;
    cursor: pointer;
    background-color: var(--button-bg);
    color: var(--button-color);
    border: none;
    border-radius: 5px;
    transition: background-color 0.3s, color 0.3s;
}

.container {
    text-align: center;
}

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

.number {
    width: 50px;
    height: 50px;
    border: 1px solid var(--border-color);
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 24px;
    margin: 0 5px;
    transition: border-color 0.3s;
}

button {
    padding: 10px 20px;
    font-size: 16px;
    cursor: pointer;
    background-color: var(--button-bg);
    color: var(--button-color);
    border: none; /* Use border: none as button style is already defined for theme-toggle */
    border-radius: 5px;
    transition: background-color 0.3s, color 0.3s;
}

.history {
    margin-top: 20px;
}