p a {
  text-decoration: none;
  color: black;
}

p a:hover {
  color: blue;
}

pre {
  color: red;
}

p span {
  background-color: rgba(255, 255, 4, 0.25);
}

h4 span {
  background-color: rgba(255, 255, 4, 0);
  font-weight: lighter;
}