body{
   font-family: Arial;
   background-color: rgb(0,0,0);
}


.middle-calulator{
   margin-left: 300px;
}
.calulation {
  color: white;
  font-size: 45px;
  margin-top: 15px;
  margin-bottom: 5px;
}

.calculator-button  {
  height: 60px;
  width: 60px;
  border-radius: 60px;
  border: none;
  font-size: 26px;
  cursor: pointer;
  margin-right: 5px;

}

.gray-button {
  background-color: rgb(51, 51, 51);
  color: white;
}

.orange-button {
  background-color: rgb(254, 160, 10);
  color: white;
}

.clear-button {
  font-size: 17px;
}

.container  {
  width: 100%;       /* not 1200px */
  padding: 2em;
}


/* Mobile first */
body {
  font-size: 16px;
}

/* Tablets */
@media (min-width: 600px) {
  body {
    font-size: 18px;
  }
}

/* Desktops */
@media (min-width: 900px) {
  body {
    font-size: 20px;
  }
}