.topnav {
  overflow: hidden;
}

.topnav a {
  float: right;
  color: black;
  display: block;
  text-decoration: none;
  text-align: center;
  font-size: 20px;
  border: 1px solid black;
  padding: 2px;
  margin: 2px;
}

.topnav a:hover {
  background-color: grey;
  color: black;
}

.topnav ul{
  padding: 2;
  margin: 2;
  list-style: none;
  position: relative;
}

.topnav ul li{
  display: inlne-block;
  background-color: grey;
}

body{
    font:20px/1.1em arial, sans-serif;
    background:white;
  }
  .center {
      max-inline-size: 100%;
      block-size: auto;
      height: auto;
      padding: 5px 50px 50px;
    }
  
  table, th, td {
      border: 1px solid;
      text-align: center;
      table-layout: auto;
    }
  .img-patch {
    max-inline-size: 100%;
    block-size: auto;
    height: auto;
    width:auto;
  }
  
  h1{
    font-size: 30px;
    font-family: Arial, Helvetica, sans-serif;
    font-weight: normal;
    text-decoration: none;
    color: black;
  }
  
  h2{
    font-size: 20px;
    font-family: Arial, Helvetica, sans-serif;
    font-weight: normal;
  }
  
  .search-container {
      font-size: 20px;
      font-family: Arial, Helvetica, sans-serif;
  }
  
  ul{
    list-style-type: none;
    margin: 0;
    padding: 2px;
    width: 100%;
    display: inline-block;
    font-size: 20px;
    background-color: white;
    top: 0;
  }
  
  li {
    display: inline-block;
    padding: 2px;
  }
  
  li a{
    color: black;
    display: inline-block;
    text-decoration: none;
    border: 1px solid black;
    padding: 2px;
  }
  
  li:hover {
    background-color: grey;
  }
  
  form button{
    border: 1px solid black;
    padding: 2px;
    font: 20px;
  }