*{
    margin: 0;
    padding: 0;
    box-sizing: content-box;
    line-height: 1.6em;
    }
  a{
    display: inline-block;
    margin: 5px;
    padding: 20px;
    background-color: #dddddd;
    text-decoration: none;
    height: 25px;
    }
  h1{
    color: blue;
    text-align: center;
    }
  p{
      text-align: justify;
      padding-left: 40px;
      padding-right: 50px;
    }
  li{
      margin-left: 100px;
      padding-left: 10px;
    }
  h2,h3{
        margin-left: 31px;
    }
  .grid{
      display: grid;
      grid-template-columns: 1fr 1fr;
    }
  .item {
      width: 90%;
      text-align: left;
      margin-left: 3.5rem;
      padding-left: 3rem; 
      border: #ccc 1px solid;
      background: #f4f4f4;
  }
  table{
    margin: 0 auto;
    table-layout: fixed ;
    width: 99% ;
    border: #ccc 2px solid;
    border-collapse: collapse;
  }
  th,td{
    text-align: center;
    border: #ccc 1px solid;
    border-collapse: collapse; 
  }
  .calculator{
    font-style: italic;
    font-size: 12px;
  }
  h2:hover{
    font-size: 30px;
    color: green;
    text-align: center;
  }
    p:hover{
      margin-top: 0;
      padding-top: 0;
      font-size: 25px;
      background-color: cornsilk;
      color: black;
      line-height: 1.4em;
    }
   
  li:hover{
    font-size: 20px;
    color: blue;
  }