I run all the A03 fics through an epub conversion but honestly it's just so I can add this css override code to the epubs.

body { margin: 0; }
a {text-decoration: none; color: black;}
a [href] {text-decoration: none; color: black;}
p {margin-top: 0pt; margin-bottom: 0pt; padding: 0pt; text-indent: 15pt; text-align: justify;}
h1 { text-align: center;}
h2 {text-align: center; }
h3 { text-align: center;}
h4 { text-align: center; }
h5 { text-align: center; }
h6 { text-align: center; }