body{
	background: rgba(0,0,0,0.2);
}
#bloque{
	position: relative;
	top: 50px;
	margin: auto;
	width: 350px;
	border:20px solid blue;
	border-radius: 25px;
	-webkit-box-shadow: 0px 10px 15px rgba(0,0,0,0.5)
	-moz-box-shadow: 0px 10px 15px rgba(0,0,0,0.5)
	-o-box-shadow: 0px 10px 15px rgba(0,0,0,0.5)
}
h1{
	color: blue;
	text-align: center;
	font-family: Comic Sans MS;
	font-weight: bold;
	text-shadow: 0px 0px 5px rgba(0,0,0,0.4);
	margin: 0px;
	padding: 0px;
	height: 40px
}
p{
	font-family: Comic Sans MS;
	color: red;
	text-shadow: 3px 3px 3px rgba(0,0,0,0.4);
	text-align: justify;
	font-size: 15px 
}
img{
	width: 300px;
	height: 150;
}
video{
	width: 300px;
	height: 200
}
audio{}
article{
	height: 40px;
	overflow: hidden;
	-webkit-transition: height 2s;
	-moz-transition: height 2s;
	-o-transition: height 2s;
}
article:focus{
	height: 250px;
	outline: none;
}
#a:focus{
	height: 150px;
}
#b:focus{
	height: 500px;
}