#pantallaDig{
  
width: auto;
margin-top: 5%;
margin-left: 10%; 
height: 100px;
border: 4px;
border-color: blue;
background-color:white;
font-size: 30px;
}

#calculadora{
 border-radius: 20px;
 border-color: blue;
 border-style: double;
 border-width: 5px;
 color :blue;
 height: auto;
 width: auto;
 
 background-color:lightyellow;
 text-align: center;
 font-size: 18px;
}
 
header{
 	text-align:center;
	background-color:lightgray;
	}
	
button{
 	padding: 0px 11px 0px 11px
	
	}