a:hover { background: yellow; color: red; }

.bold    { font-weight: bold; }
.center  { text-align: center; margin-left: auto; margin-right: auto; }
.italic  { font-style: italic; }
.larger  { font-size: larger; }
.large   { font-size: large; }
.small   { font-size: small; }
.smaller { font-size: smaller; }
.x-large { font-size: x-large; }
.x-small { font-size: x-small; }