body{
  font-family: Arial, Helvetica, sans-serif;
  background-color: black;
}
.showNumber{
  font-size: 45px;
  margin: 15px 0 5px 0;
  color: white;
}
button{
  width: 60px;
  height: 60px;
  font-size: 26px;
  padding: 1px 6px ;
  border-radius: 60px;
  border: none;
  background-color: rgb(51, 51, 51);
  color: white;
  margin-right: 5px;
}
.gray-btn{
  background-color: rgb(254, 160, 10);
}
.clear-btn{
  font-size: 17px;
}
.backspace{
  font-size: 17px;
  width: 100px;
  border-radius: 100px;
}