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

#div1{
  width: 400px;
  height: 400px;
  margin:auto;
  margin-top: 100px;
  padding-top: 80px;
  padding-left: 65px;
  background-color: DarkSlateGray;
  border-radius: 10px;
  border-style: ridge;
}

#display{
  font-size: 30px;
  font-weight: bold;
  width: 340px;
  height: 70px;
  margin-bottom: -20px;
  background-color: PaleGreen;
  border-color: PaleGreen;
}

#display2{
  font-size: 30px;
  font-weight: bold;
  width: 340px;
  height: 70px;
  margin-bottom: 10px;
  background-color: PaleGreen;
  border-color: PaleGreen;
}

button{
  width: 60px;
  height: 40px;
  font-weight: bold;
  background-color: white;
  border-radius: 10px;
  margin-bottom: 10px;
  margin-right: 5px;
}

#boton0{width: 130px;}
#botonac{background-color: blue; color: white}
#botondel{background-color: blue; color: white}