:root {
    --background-color-light: #f0f0f0;
    --text-color-light: #333;
    --element-bg-color-light: #fff;
    --border-color-light: #ccc;

    --background-color-dark: #333;
    --text-color-dark: #f0f0f0;
    --element-bg-color-dark: #555;
    --border-color-dark: #888;
}

body {
    font-family: sans-serif;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    background-color: var(--background-color-light);
    color: var(--text-color-light);
}

body.dark-theme {
    background-color: var(--background-color-dark);
    color: var(--text-color-dark);
}

.container {
    text-align: center;
}

.lotto-numbers {
    display: flex;
    justify-content: center;
    gap: 10px;
    margin: 20px 0;
}

.lotto-numbers span {
    display: flex;
    justify-content: center;
    align-items: center;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background-color: var(--element-bg-color-light);
    border: 1px solid var(--border-color-light);
    font-size: 1.2em;
}

body.dark-theme .lotto-numbers span {
    background-color: var(--element-bg-color-dark);
    border-color: var(--border-color-dark);
}

#generate-btn, #theme-toggle-btn {
    padding: 10px 20px;
    font-size: 1em;
    cursor: pointer;
    margin-top: 10px;
}