Challenge: minimal css code with great impact

CSS for this page

/* Core modifications */
.page-header {
	color: #1a535c;
	margin-bottom: 1rem;
}
.mod-articlesnews {
	margin-top: 1rem;
}
.mod-articlesnews__item {
	padding-left: 1rem;
	border-left: 3px solid #1a535c;
	margin-bottom: 1rem;
	border-bottom: 3px solid #1a535c;
}
/* Cassiopeia modifications */
/* Header */
.container-header {
	background-image: none;
	background-color: #1a535c;
}
.brand-logo {
	text-decoration: none;
}
/* Footer */
.container-footer {
	background-image: none;
	background-color: #1a535c;
}
/* General modifications */
body {
	background-color: #eff9fb;
}
blockquote {
	padding-top: 10px;
}
blockquote::before {
  font-family: Arial;
  color: #40b7c9;
  content: "\201C";
  font-size: 4em;
  line-height: 0.1em;
  margin-right: 0.1em;
  vertical-align: -0.4em;
}
blockquote p {
  display: inline;
}