body {
  margin: 0;
  padding: 0;
  background: linear-gradient(to right, purple, maroon);
  text-align: center;
  font-size: 60px;
  }


*, *::before, *::after {
  box-sizing: border-box;
  font-family: paypas, sans-serif;
  font-weight: normal;
}

*, *::before, *::after {
  box-sizing: border-box;
  font-family: Gotham Rounded, sans-serif;
  font-weight: normal;
}

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

  .calculator-grid > button {
    cursor: pointer;
    font-size: 2rem;
    border: 1px, solid #FFFFFF;
    outline: none;
    background-color: rbga(255, 255, 255, 0.75);
  }

   
    
    
    .output{
      grid-column: 1 / -1;
      background-color: rgba(0, 0, 0, 0.75);
      display: flex;
      align-items: flex-end;
      justify-content: space-around;
      flex-direction: column;
      padding: 10px;
      word-wrap: break-word;
      word-break: break-all;
    }

    .output .previous-operand{
      color: rgba(255,255, 255, 0.75);
      font-size: 1.5rem;
    }

    .output .current-operand{
      color: white;
      font-size: 2.5rem;
    }