:root {
  --background-color: #f0f0f0;
  --text-color: #333;
  --container-bg-color: white;
  --button-bg-color: #007bff;
  --button-text-color: white;
}

body.dark-mode {
  --background-color: #333;
  --text-color: #f0f0f0;
  --container-bg-color: #444;
  --button-bg-color: #555;
  --button-text-color: white;
}

body {
    font-family: sans-serif;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    background-color: var(--background-color);
    color: var(--text-color);
    transition: background-color 0.3s, color 0.3s;
}

#theme-toggle {
    position: absolute;
    top: 20px;
    right: 20px;
    padding: 10px;
    cursor: pointer;
    border: 1px solid var(--text-color);
    background-color: var(--container-bg-color);
    color: var(--text-color);
    border-radius: 5px;
}

.container {
    text-align: center;
    background-color: var(--container-bg-color);
    padding: 2em;
    border-radius: 10px;
    box-shadow: 0 0 10px rgba(0,0,0,0.1);
}

lotto-numbers {
    display: block;
    margin: 20px 0;
}

#generate-btn {
    padding: 10px 20px;
    font-size: 16px;
    cursor: pointer;
    border: none;
    border-radius: 5px;
    background-color: var(--button-bg-color);
    color: var(--button-text-color);
}