body {
  background: radial-gradient(#646363, #000000);
  font-family: Arial, Helvetica, sans-serif;
  display: flex;
  align-items: center;
  justify-content: center;
  height: 100vh;
}
button {
  border-radius: 4px;
  border: none;
  font-size: 20px;
  cursor: pointer;
  box-shadow: 0 4px 0 0 rgb(158, 158, 158);
  transition: transform 150ms, box-shadow 150ms;
}
button:hover {
  transform: translate3d(0px, 2px, 0px);
  box-shadow: 0 2px 0 0 rgb(158, 158, 158);
}

button:active {
  transform: translate3d(0px, 4px, 0px);
  box-shadow: none;
}
.calculator-body {
  width: 300px;
  background-color: #222831;
  border-radius: 5px;
}
.calculator-display {
  height: 60px;
  background-color: #dde0ab;
  margin: 20px;
  box-shadow: inset 0 0 5px rgba(0, 0, 0, 1);
}
.calculator-display p {
  text-align: right;
  font-size: 20px;
  padding: 15px 10px 15px 10px;
  font-family: "Calculator", sans-serif;
  font-weight: bold;
}
.buttons {
  margin: 20px;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  grid-auto-rows: minmax(50px, auto);
  grid-gap: 10px;
}
.iqual-button {
  grid-column: 4;
  grid-row: 4/6;
}
.b0-button {
  grid-column: 1/4;
  grid-row: 5;
}
.b0-button,
.b-button {
  background-color: #4f76b3;
  color: white;
  box-shadow: 0 4px 0 0 #395380;
}
.b0-button:hover,
.b-button:hover {
  transform: translate3d(0px, 2px, 0px);
  box-shadow: 0 2px 0 0 #395380;
}
.b0-button:active,
.b-button:active {
  transform: translate3d(0px, 4px, 0px);
  box-shadow: none;
}
.c-button {
  background-color: #f96d00;
  color: white;
  box-shadow: 0 4px 0 0 #803700;
}
.c-button:hover {
  transform: translate3d(0px, 2px, 0px);
  box-shadow: 0 2px 0 0 #803700;
}
.c-button:active {
  transform: translate3d(0px, 4px, 0px);
  box-shadow: none;
}