body {
  background-color: black;
}
.calculadora {
  background-color: lightblue;
  display:block;
  margin-left:450px;
  margin-top: 100px;
  padding:25px;
  width:450px;
  height:550px;
  border-radius:25px;
}
.calculadora td button{
  display:block;
  width:70px;
  height:70px;
  font-size:25px;
}
#resultado{
  display:block;
  text-align:center;
  font-size:40px;
  margin-bottom:50px;
  width:365px;
  height:100px;
  line-height:100px;
  background-color:white;
  border-radius:25px;
  overflow-y: scroll;
}