body {
  display: flex;
  flex-direction: column;
  justify-content: flex-end; /* Pushes content to the bottom */
  height: 90vh;             /* Takes up the full screen height */
  margin: 0;
  background: #222;
  color: white;
  font-family: Arial, sans-serif;
}

#Input_Display,#Result_Display{
  width: 100%;
  height: 100px;
  font-size: 80px;
  text-align: right;
  background: transparent;
  border: none;
  padding: 10px;
  box-sizing: border-box;
}

.buttonsArea {
  justify-content: center;
  text-align: center;
  width: 100%;
  box-sizing: border-box;
  margin-top: 200px;
}

button{
  font-size: 80px;
  height: 200px;
  width: 200px;
  margin: 10px;
  background: #333;
  color: white;
  border: none;
  border-radius: 50%;
}

.special {
  background: darkgray;
  color: black;
}

.operators {
  background: orange;
}

.zerobtn {
  width: 420px; /* Adjusted to fit a 2-button span nicely */
  border-radius: 999px;
}