html {
	height: 100%;
	background: white;
	background: radial-gradient(circle, #fff 20%, #ccc);
	background-size: cover;
}

.contenedor{
	width: 70%;
  	margin: 25 auto;
	background-color:#C0C0C0;
	border-bottom-color:#000040;
	position:relative;
	border: 4px #BA7806 ridge;
	color: #B07105;
	text-align: center;
	left:15%;
	
	
}


/*aspectos generales: bordes y color de fondo de calculadora*/
.calculadora {

	width: 95%;
	height: auto;
	text-align: left;
	margin: 50px auto;
	padding: 10px 10px 9px;
	
	background: #A26F3C;
	background: linear-gradient(#A26F3C, #F88B1E);
	border-radius: 3px;
	box-shadow: 0px 4px #F8B26C, 0px 10px 15px rgba(0, 0, 0, 0.2);
	 }

/*pantalla de visualización: bordes, posición, color de fondo, estilo letra.*/
.screen { 
	width: 90%;
	height:45px;  
	color: #09155F;
	font-weight: bold;
	font-size: 30px;
	vertical-align:middle;
	text-align: right; border: 2px orange solid;
    left: 23px;  padding: 0px 5px;
    padding: 0 10px;
	margin-right: 30px;
	background: rgba(0, 0, 0, 0.2);
	border-radius: 3px;
	box-shadow: inset 0px 4px rgba(0, 0, 0, 0.2);
    background-color: white; font-family: "courier new"; 
   	overflow: hidden;
   }

#textoPantalla2 { 
	width: 185px; border: 2px orange solid; text-align: right; 
	position: relative; left: 23px;  padding: 5px 5px;
	font-weight: bold;
    background-color: white; font-family: "courier new"; 
    overflow: hidden;}

/*botones normales: anchura y margen*/
.calculadora [type=button] { 

	
	width: 14%;
	height: 36px;
	padding: 0;  
	margin: 0 4px 4px 0;
	cursor: pointer;
	border-radius: 3px;
	box-shadow: 0px 4px rgba(0, 0, 0, 0.2);
	color: #888;
	font-size: 16px;
	line-height: 20px;
	text-align: center;
	user-select: none;
	
	transition: all 0.2s ease;
}
.calculadora [type=button]:hover {
	background: #9c89f6;
	box-shadow: 0px 4px #6b54d3;
	color: white;
}


/*botones especiales*/
.calculadora input.largo { 

	color: red; 
	width: 14%;
	height: 36px; 
	margin-top: 10px;
}

.calculadora input.funesp {

	color: red; 
	width: 14%;
	height: 36px;
}