body {
    font-family: sans-serif;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    background-color: #f0f0f0;
    margin: 0;
    transition: background-color 0.3s, color 0.3s;
}

body[data-theme="dark"] {
    background-color: #333;
    color: #fff;
}

#app {
    background-color: #ffffff;
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
    text-align: center;
    position: relative;
}

body[data-theme="dark"] #app {
    background-color: #444;
}

#numbers {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin: 2rem 0;
}

.number {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background-color: #4CAF50;
    color: #ffffff;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 1.5rem;
    font-weight: bold;
}

#generate {
    background-color: #4CAF50;
    color: #ffffff;
    border: none;
    padding: 0.75rem 1.5rem;
    border-radius: 4px;
    font-size: 1rem;
    cursor: pointer;
    transition: background-color 0.3s;
}

#generate:hover {
    background-color: #45a049;
}

.theme-switch-wrapper {
    position: absolute;
    top: 1rem;
    right: 1rem;
}

.theme-switch {
    display: inline-block;
    height: 24px;
    position: relative;
    width: 50px;
}

.theme-switch input { display: none; }

.slider {
    background-color: #ccc;
    bottom: 0;
    cursor: pointer;
    left: 0;
    position: absolute;
    right: 0;
    top: 0;
    transition: .4s;
}

.slider:before {
    background-color: #fff;
    bottom: 4px;
    content: "";
    height: 16px;
    left: 4px;
    position: absolute;
    transition: .4s;
    width: 16px;
}

input:checked + .slider {
    background-color: #2196F3;
}

input:checked + .slider:before {
    transform: translateX(26px);
}

.slider.round {
    border-radius: 34px;
}

.slider.round:before {
    border-radius: 50%;
}