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;
}