#calcOutput{
    background-color:rgb(78, 78, 78);
    color: white;
    font-size:27px;
    width:250px;
    height:75px;
    margin: auto;
    border-top-right-radius:1em;
    border-top-left-radius:1em;
    text-align: right;
  }
  #calculator{
    background-color:#18BC9C;
    padding-top:12px;
    width:250px;
    height:270px;
    margin:auto;
    border-bottom-right-radius:2em;
    border-bottom-left-radius:2em;
  }
  #calcSteps{
    padding-left:10px;
    padding-right:10px;
    font-size:2em;
  }
  .calcBtn{
    font-size:25px;
    padding:1px;
    margin:4px;
    width:45px;
    height:40px; 
  }
  .calcBigBtn{
    width:101px;
    height:40px;
    padding:1px;
    margin:4px;
    font-size:25px;
  }
  .btn-primary {
    background-color: rgb(0, 167, 223);
    border-style: solid;
    border-color: rgb(0, 120, 160);
    color: white;
  }
  .btn-danger {
    background-color: rgb(248, 86, 86);
    border-style: solid;
    border-color: red;
  }
  .btn-default {
    background-color: rgb(184, 184, 184);
    border-style: solid;
    border-color: rgb(136, 136, 136);
  }