*{
    box-sizing: border-box;
    padding: 0;
    margin: 0;
  }

  body {
    padding: 0;
    margin: 0;
  }
  .calc {
  margin: auto;
    width: 400px;
    background-color: black;
    color: white;
  }

  .screen{
    color: white;
    font-size: 40px;
    font-family: "Courier New", Courier, monospace;
    text-align: right;
  height: 90px;

  padding: 22px 10px ;
  width: 100%;
  }

  .calc-button{
    border: black 1px solid;
    border-radius: 0px;
    height: 100px;
    width: 25%;
    color: black ;
    background-color: #d8d9db;
    font-size: 40px;
    cursor: pointer;
  }

.calc-button-row:last-child{
    border-bottom: red 2x solid;
}
  .calc-button:hover{
    background-color: #ebebeb;
  }

  .calc-button:active{
    background-color: #bbbcbe;
  }

  .clear{
    width: 50%;
  }

  .zero{
    width: 75%;
  }
  button{
    margin: 0px;
  }

  .calc-button:last-child{
    background-color:  #df974c;
    color: white;
  }
  .calc-button:last-child:hover {
    background-color: #dfb07e;
  }
  
  .calc-button:last-child:active {
    background-color: #dd8d37;
  }

  .calc-button-row {
    display: flex;
    align-content: stretch;
    justify-content: space-between;
  }
  
.calc-button-row:last-child {
    padding-bottom: 0;

  }

.reset{
  width: 70px;
  height: 30px;
  font-size: large;
  background-color: green;
  margin: 12px 12px;
}