:root {
    --primary-color: #2c3e50;
    --secondary-color: #ecf0f1;
    --accent-color: #3498db;
    --text-color: #ffffff;
}

body {
    font-family: 'Arial', sans-serif;
    background-color: var(--primary-color);
    color: var(--text-color);
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
}

.container {
    text-align: center;
}

h1 {
    font-size: 3em;
    margin-bottom: 20px;
}

.numbers-display {
    display: flex;
    justify-content: center;
    gap: 10px;
    margin-bottom: 30px;
}

.number-ball {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    background-color: var(--accent-color);
    color: var(--text-color);
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 1.5em;
    font-weight: bold;
    box-shadow: 0 4px 8px rgba(0,0,0,0.2);
}

#generate-button {
    background-color: var(--accent-color);
    color: var(--text-color);
    border: none;
    padding: 15px 30px;
    font-size: 1.2em;
    border-radius: 5px;
    cursor: pointer;
    transition: background-color 0.3s ease;
    box-shadow: 0 2px 4px rgba(0,0,0,0.2);
}

#generate-button:hover {
    background-color: #2980b9;
}