Template:Silmarillion-chapters/styles.css

/* Desktop default */
table.silmarillion-chapters {
  float: right;
  clear: right;
  width: 320px;
  max-width: 320px;
  margin: 0 0 1em 1em;
}

/* Mobile */
@media (max-width: 720px) {
  table.silmarillion-chapters {
    float: none;
    clear: both;
    width: 100%;
    max-width: 100%;
    margin: 0 auto 1em auto; /* centered */
  }
}