site.css

@import url(https://fonts.googleapis.com/css?family=Open+Sans:400,700);

*, *::before, *::after {
	box-sizing: border-box;
}

body {
	margin: 0;
	color: #fff;
	background-color: #1d3f59;
	font: 1.5rem/1.5 'Open Sans', sans-serif;
}

.prose {
	max-width: 900px;
	margin: 0 auto;
	padding: 40px;
}

h1 {
	margin: 0 0 40px;
	line-height: 1.2;
	font-size: 3.5rem;
	font-weight: normal;
}

h2 {
	font-size: 2rem;
	font-weight: normal;
}

a {
	color: #ffd47b;
	text-decoration: none;
}

a:hover {
	text-decoration: underline;
}

.pond {
	position: absolute;
	top: 0;
	right: 0;
	bottom: 0;
	left: 0;
	text-align: center;
}

.left-pond {
	left: 0;
	right: 50%;
}

.right-pond {
	right: 0;
	left: 50%;
}

.fish {
	position: absolute;
	width: 50px;
	height: 30px;
	border-radius: 50%;
	margin: -15px 0 0 -20px;
	background-color: currentColor;
}

/* tail */
.fish::before {
	content: '';
	display: block;
	position: absolute;
	left: -10px;
	width: 0;
	height: 0;
	border-left: solid 25px currentColor;
	border-top: solid 15px transparent;
	border-bottom: solid 15px transparent;
}

/* eye */
.fish::after {
	content: '';
	display: block;
	position: absolute;
	top: 8px;
	left: 34px;
	width: 6px;
	height: 6px;
	background-color: #fff;
	border-radius: 50%;
}