*,
*::before,
*::after {
  box-sizing: border-box;
  font-family: "Poppins", sans-serif;
  font-weight: 400;
}

body {
  padding: 0;
  margin: 0;

  display: flex;
  align-items: center;
  justify-content: center;
  background: #222;
}

.grid {
  display: grid;
  justify-content: center;
  align-content: center;
  min-height: 100vh;
  grid-template-columns: repeat(4, 100px);
  grid-template-rows: minmax(120px, auto) repeat(5, 100px);
}

.grid > button {
  cursor: pointer;
  font-size: 2rem;
  border: 2px solid #fff;
  outline: none;
  color: #fff;
  font-weight: 700;
  background-color: #ff6f6f;
}

.grid > button:hover {
  background-color: #ff6f6fad;
}

.two {
  grid-column: span 2;
}

.calculatorOutput {
  grid-column: 1 / -1;
  background-color: #2a2a2a;
  border: 2px solid #fff;
  display: flex;
  align-items: flex-end;
  justify-content: space-around;
  flex-direction: column;
  padding: 10px;
  word-wrap: break-word;
  word-break: break-all;
  border-top-left-radius: 10px;
  border-top-right-radius: 10px;
}

.calculatorOutput .previousOperand {
  color: rgba(255, 255, 255, 0.75);
  font-size: 1.5rem;
}

.calculatorOutput .currentOperand {
  color: white;
  font-size: 2.5rem;
}

/* responsive */
@media (max-width: 425px) {
}