style.css

body {
	overflow-y: scroll;
	color: #333;
}

a {
	color: inherit;
}

.wrapper {
	position: relative;
	overflow: hidden;
	padding-bottom: 20px;
}

.ribbon {
	overflow: hidden;
	white-space: nowrap;
	position: absolute;
	top: 50px;
	right: 50px;
	-webkit-transform-origin: top center;
	-ms-transform-origin: top center;
	transform-origin: top center;
	-webkit-transform: translate(50%, 0%) rotate(45deg);
	-ms-transform: translate(50%, 0%) rotate(45deg);
	transform: translate(50%, 0%) rotate(45deg);
	box-shadow: 0 0 8px rgba(0, 0, 0, .5);
}

@-webkit-keyframes pulse {
	50% {box-shadow: 0 0 10px rgba(0, 0, 0, .2);}
}

@keyframes pulse {
	50% {box-shadow: 0 0 10px rgba(0, 0, 0, .2);}
}

.ribbon:hover {
	-webkit-animation: pulse .5s infinite;
	animation: pulse .5s infinite;
}

.ribbon a {
	border: 1px solid #0277BD;
	color: #29B6F6;
	display: block;
	font-size: .875em;
	font-weight: bold;
	margin: 1px 0;
	padding: 10px 60px;
	text-align: center;
	text-decoration: none;
}

.container {
	box-sizing: border-box;
	width: 100%;
	padding: 0 15px;
	margin: 0 auto;
}

@media (min-width: 600px) {
	.container {
		width: 80%;
	}
}

@media (min-width: 990px) {
	.container {
		width: 60%;
	}
}

.header {
	font-size: 1.25em;
	margin: 2em 0;
}

.header h1 {
	font-weight: normal;
	margin: .5em 0;
}

.collection {
	margin: .5em 0 2em;
}

.collection-header {
	-webkit-user-select: none;
	border-bottom: 1px solid #e0e0e0;
	padding: 10px 20px;
	font-size: 1.125em;
	line-height: 1.5rem;
	color: #29B6F6;
}

.collection-header .icon {
	color: #0277BD;
	float: right;
	font-size: 1.5em;
	font-weight: bold;
	line-height: 1.5rem;
	transform: rotate(135deg);
	transition: transform 300ms;
}

.collection-header[data-akkordion-active] .icon {
	transform: none;
}

.collection-item {
	line-height: 1.5em;
	padding: 10px 20px;
	padding-left: 30px;
	color: #424242;
}

.footer {
	text-align: center;
}