h1 {
color: red;
text-align: center;
font-size: 50px;

}
.calculadora {position: center; border: 10px blue ridge;  width: 500px;text-align: center;
               background-color: gray; position: absolute;
	left: 250px;
	top: 200px;}


.text { width: 185px; border: 2px black solid; text-align: right; 
                 position: relative; left: 23px;  padding: 0px 5px;
                 background-color: white; font-family: "courier new"; 
                 overflow: hidden;}


.boton { width: 50px; padding: 0; height:30px; }