Source: accordionCSS [edit]

.accordion{
	width: 400px;
	margin: 10px auto;
	box-shadow: 
		0px 0px 0px 1px rgba(155,155,155,0.3), 
		0px 2px 2px rgba(0,0,0,0.1);
}
.accordion label{
	font-family: Arial, sans-serif;
	padding: 5px 20px;
	position: relative;
	display: block;
	height: 30px;
	cursor: pointer;
	color: #777;
	line-height: 33px;
	font-size: 19px;
	background: #EFEFEF;
    border: 1px solid #CCC;
}
.accordion label:hover{
	background: #F3F3F3;
}
.accordion input + label {
	-webkit-transition: all 0.3s ease-in-out;
	-moz-transition: all 0.3s ease-in-out;
	-o-transition: all 0.3s ease-in-out;
	-ms-transition: all 0.3s ease-in-out;
	transition: all 0.3s ease-in-out;
}
.accordion input:checked + label,
.accordion input:checked + label:hover{
	background: #CDECC5;
	color: #3d7489;
	box-shadow: 
		0px 0px 0px 1px rgba(155,155,155,0.3), 
		0px 2px 2px rgba(0,0,0,0.1);
}
.accordion input{
	display: none;
}
.accordion .article{
	background: rgb(255, 255, 255);
	overflow-y: scroll;
	height: 0px;
	-webkit-transition: all 0.3s ease-in-out;
	-moz-transition: all 0.3s ease-in-out;
	-o-transition: all 0.3s ease-in-out;
	-ms-transition: all 0.3s ease-in-out;
	transition: all 0.3s ease-in-out;
}
.accordion .article p{
	font-style: italic;
	color: #777;
	line-height: 23px;
	font-size: 14px;
	padding: 20px;
}
.accordion input:checked ~ .article{
	-webkit-transition: all 0.5s ease-in-out;
	-moz-transition: all 0.5s ease-in-out;
	-o-transition: all 0.5s ease-in-out;
	-ms-transition: all 0.5s ease-in-out;
	transition: all 0.5s ease-in-out;
}
.accordion input:checked ~ .article.ac-small{
	height: auto;
	max-height: 155px;
}
.accordion input:checked ~ .article.ac-medium{
	height: auto;
	max-height: 195px;
}
.accordion input:checked ~ .article.ac-large{
	height: auto;
	max-height: 245px;
}
.panel {
    display: block;
    padding: 10px;
    width: 185px;
    background-color: #424242;
    border-bottom: 1px solid black;
}


.panel a:link, .panel a:visited
{
color: #BDBDBD;
text-decoration: none;
}

.panel a:hover
{
background-color: #369;
color: #fff;
}