body{
  background-color: lightgrey;
}
.fondo{
  height: 300px;
  width: 700px;
  background-image: url(fondo.png);
}
h1{
  background-color: Red;
}
p{
  font-size: 35px;
  height: 40px;
  background-color: lightBlue;
  text-align: right;
}

.Operadores{
  background-color: grey;
  background-position: left;
}

.Num{
  align-content: left;
  background-color: pink;
}
.res{
  font-size: 20px;
  text-align: left;
  }