* {
    box-sizing: border-box;
    padding: 0;
    margin: 0;
    font-family: "Open Sans", sans-serif;
    font-weight: bold;
  }
  
  body {
    background-color: rgb(20, 19, 19);
    transition: 0.8s;
    -webkit-transition: 0.8s;
    -moz-transition: 0.8s;
    -ms-transition: 0.8s;
    -o-transition: 0.8s;
  }
  h1 {
    margin-top: 25vh;
    text-align: center;
    margin-bottom: 1.5%;
    color: #fff;
  }
  .container {
    width: 370px;
  }
  .result {
    width: 40%;
  }
  input {
    padding: 25px;
    color: rgb(255, 255, 255);
    font-size: 1em;
    cursor: pointer;
    width: 70px;
    background-color: rgb(47, 51, 50);
    border: none;
    outline: none;
    border-radius: 4px;
    -webkit-border-radius: 4px;
    -moz-border-radius: 4px;
    -ms-border-radius: 4px;
    -o-border-radius: 4px;
  }
  
  .first-row,
  .second-row,
  .third-row,
  .fourth-row,
  .fifth-row {
    margin-bottom: 3px;
  }
  input[type="text"] {
    background-color: rgb(47, 51, 50);
  }
  input[type="button"]:hover {
    background-color: rgb(160, 160, 160);
    color: #fff;
  }
  .clear {
    color: #fff;
    background-color: rgb(255, 42, 42);
  }
  button {
    border: none;
    background-color: rgb(39, 36, 36);
    padding: 10px;
    color: white;
    margin: 2px;
    cursor: pointer;
    outline: none;
    border-radius: 4px;
    -webkit-border-radius: 4px;
    -moz-border-radius: 4px;
    -ms-border-radius: 4px;
    -o-border-radius: 4px;
  }
  
  button a {
    text-decoration: none;
    color: #fff;
  }
  .bottom-buttons {
    float: left;
    margin-left: 10%;
    margin-top: 0.7%;
  }
  
  @media (max-width: 640px) {
    h1 {
      margin-top: 15vh;
    }
  }