body {
    background-image: url(fondo.jpg);
}

.Calculadora {
  padding-top: 20px;
  padding-bottom: 23px;
  background-color: rgb(145, 145, 145);
  border-radius: 20px 20px 20px 20px;
  border: 6px thick;
  border-color: rgba(61, 61, 61);
  text-align: center;
  margin-top: 100px;
  margin-right: auto;
  margin-left: auto;
  width: 500px;
}
  
.Display { 
  background-color: white;
  text-align: right;
  font-size: 30px;
  width: 400px;
  height: 90px;
  border-radius: 20px 20px 20px 20px;
  border: 6px ridge;
  margin-left: auto;
  margin-right: auto;
}
  
.Botones { 
  text-align: center;
}
  
button{
  background-color: rgba(87, 87, 90, 0.6);
  color: black;
  padding: 14px;
  font-size: 16px;
  margin: 5px 2px;
  margin-left: 16px;
  border-radius: 20px 20px 20px 20px;
  border: 3px solid rgba(87, 87, 90, 0.6);
  width: 75px;
}