.book-content .h1 { font-size: x-large; font-weight: bold; text-transform: uppercase; text-align: center; margin-top: 3ex; }
.book-content .h2 { font-size: large; font-weight: bold; text-transform: uppercase; text-align: center; margin-top: 2ex; }
.book-content .h3 { font-size: medium; font-weight: bold; text-transform: uppercase; text-align: center; margin-top: 1.5ex; }