style.css

main strong {
  background-image: repeating-linear-gradient(-35deg,
    #fcf69f 0, #fcf69f 2px,
    transparent 2px, transparent 4px
  );
  background-repeat: no-repeat;
  background-position: left bottom;
  background-size: 100% 0.4em;
}

div.tokupon {
  background-image: url("images/tokupon.png");
  margin-right: 20px;
  background-size: 80px;
  background-repeat: no-repeat;
  background-position: 95% 90%;
  min-height: 140px;
  max-width: 100%;
}

div.tokupon_none {
  background-image: none
}

div.callout-caption-container {
  background-repeat: no-repeat;
  background-size: 24px;
  background-position: 95% 0%;
  min-height: 30px;
}

div.callout-caption-container {
  background-image: url("images/tokupon_normal.svg");
}

div.references div strong {
  font-weight: bold;
  background: none;
}

span.citation strong {
  font-weight: normal;
  background: none;
}