* {margin: 0; padding: 0;}
body { 
	height: 100%;
	width: 100%;
	color: whitesmoke;
	background: url(pictures/fondo3.jpg);
	padding: 2px;
}
.subrayar {
	text-decoration: underline;
	font-weight: bold;
	font-size: 20px;
	padding: 4px;
}
header, footer {
	padding: 1%;
	display: block;
}
nav{    
	 background: url(pictures/fondo3.png);
    overflow:hidden;
    padding:10px;
}
nav ul{
    list-style:none;
    margin:0 10px 0 10px;
    padding:0;
}
nav ul li { 
    float:left;
    font-family:Arial, Helvetica, sans-serif;
    font-size:16px;
    font-weight:bold;
    margin-right:10px;
    text-align:center;
}
nav ul li:hover{
    border:1px solid #E3E3E3;
    border-radius: 5px;
}
nav a {
 color: whitesmoke;
}
article {
	font-family: Arial, Helvetica, sans-serif;
	padding: 1%;
}
article h1 {
	font-weight: bolder;
	text-align: center;
}
article h2 {
	font-size: 1em;
	padding: 1%;
	font-variant: small-caps;
	font-weight: bold;
}
article li {
	margin-left: 50px;
}
.caja {
	height:75px;
	width: 100px;
	position: static;
	right: 200px;
	top: 100px;
}
.caja img {
	display: block;
	margin: 10px auto;
	width: 90%;
}
#contenedor {
	padding: 10px;
	margin: 10px;
	display: -webkit-box;
	display: -ms-flexbox;
	display: -webkit-flex;
	display: flex;
	-webkit-flex-wrap: wrap;
}
.horizontal {
	padding: 3px;
	border: 1px solid black;
	background-color: white;
	width: 300px;
	height: 196px;
	margin: 10px;
}
#imgCrono
{
   width: 200px;
   height: 300px;
   position: relative;
   padding-left: 1%;
   margin-left: 70px;
}

#crono
  {
    position: absolute;
    bottom: 140px;
    left: 40px;
    top: 55px;
    font-size: 1.5em;
    color: black;
}
#cambiar
  {
    margin-left: 10px;
    color: blue
  }
#inicializar
  {
    margin-left: 45px;
    color: red
  }