body {
    font-family: Arial, sans-serif;
    text-align: center;
}

nav {
    background: #eee;
    padding: 1rem;
}

nav a {
    margin: 0 10px;
    text-decoration: none;
    font-weight: bold;
}

canvas {
	
    max-width: 600px;
    margin: 20px auto;
    display: block;
}

.bookChart {
	height: 450px;
}