a
  background-color: transparent

abbr[title]
  text-decoration: underline dotted

code,
kbd,
samp,
pre
  font-family: monospace, monospace
  font-size: 1em

sub,
sup
  font-size: 75%
  line-height: 0
  position: relative
  vertical-align: baseline

sub
  bottom: -0.25em

sup
  top: -0.5em