body {
  height: 100%;
  font-family:  Arial, Tahoma, sans-serif;
  text-align: center;
  margin: 2%;
 }
 
#caja {
  margin: 1%;
 }
 
 #fondo {
   background-image: url("img/crono.jpg");
   background-repeat: no-repeat;
   background-position: center top;
   background-size: 100%;
   width: 300px;
   height: 430px;
   margin: 0 auto;
}
 
h1 {
  margin: 1px;
  padding:1%;
  font-weight: 300;
  font-size: 2em;
  font-weight: bold;
  color:white;
  background-color: gray;
  border: 0px solid;
			margin: ,03%;
			padding: 1%;
			position: relative;
			border-color:white;
			border-style:solid;
			border-radius:5px;
			-moz-box-shadow: 0 0 1px 1px #888;
			-webkit-box-shadow: 0 0 1px 1px#888;
			box-shadow: 0 0 5px #888;	  
}

p {
  font-size: 1.2em;
  padding: 0,1;
  color: blue;
}

mark {
    background-color: #FFFF99;
    color:red;
}

.cronometro {
  position: relative; 
  width: 45%; 
  left: 0;
  top: 49%;
  font-family: Arial,Tahoma,sans-serif;
  font-size: 265%;
  color:#0174DF;
  background: black;
  border: 0px solid;
			margin: ,03%;
			padding: 1%;
			position: relative;
			border-color:white;
			border-style:solid;
			border-radius:5px;
			-moz-box-shadow: 0 0 1px 1px #888;
			-webkit-box-shadow: 0 0 1px 1px#888;
			box-shadow: 0 0 5px #888;	  
  }
  
button  {
	height: 50px;
    font-size: 1em;
}

#error{
  font-size: 2em;
  }