Center the body, cap its width for readable line lengths, and set a comfortable line-height, font size, and text color. Tighten heading line-height separately since headings need less breathing room than body text.
css
body {
margin: 40px auto;
max-width: 650px;
line-height: 1.6;
font-size: 18px;
color: #444;
padding: 0 10px;
}
h1,
h2,
h3 {
line-height: 1.2;
}