Challenge: minimal css code with great impact

CSS for this page

/* Core modifications */
.page-header {
	color: #824670;
	margin-bottom: 1rem;
}
.page-header h1::after {
  content: '';
  height: 12px;
  background-color: #F4EDEA;
  width: 5rem;
  display: block;
  margin-top: -1rem;
}
.mod-articlesnews__item:not(:last-child) {
	margin-bottom: 1rem;
}
.newsflash-title {
	background-color: #824670;
	color: #fff;
	padding: .5rem;
}
/* Cassiopeia modifications */
/* Header */
.container-header {
	background-image: none;
	background-color: #004e89;
}
.brand-logo {
	text-decoration: none;
}
/* Sidebar */
.container-sidebar-right {
	background-color: #F4EDEA;
	margin-top: 1rem;
	padding: 0 1rem;
}
/* Footer */
.container-footer {
	background-image: none;
	background-color: #824670;
}
/* General modifications */
blockquote {
	padding-top: 10px;
}
blockquote::before {
  font-family: Arial;
  color: #ccc;
  content: "\201C";
  font-size: 4em;
  line-height: 0.1em;
  margin-right: 0.1em;
  vertical-align: -0.4em;
}
blockquote p {
  display: inline;
}

Carl Sagan III

The nitrogen in our DNA, the calcium in our teeth, the iron in our blood, the carbon in our apple pies were made in the interiors of collapsing stars. We are made of starstuff.
Carl Sagan

Carl Sagan II

If we continue to accumulate only power and not wisdom, we will surely destroy ourselves.
Carl Sagan

Carl Sagan I

If we can't think for ourselves, if we're unwilling to question authority, then we're just putty in the hands of those in power. But if the citizens are educated and form their own opinions, then those in power work for us. In every country, we should be teaching our children the scientific method and the reasons for a Bill of Rights. With it comes a certain decency, humility and community spirit. In the demon-haunted world that we inhabit by virtue of being human, this may be all that stands between us and the enveloping darkness.
Carl Sagan