body {
   font-family:Sans-Serif;
   background-color: white;
   width:1000px;
   height:auto;
}  
.topnav {
  overflow: hidden;
  background-color: #333;
}

.topnav a {
  float: left;
  color: #f2f2f2;
  text-align: left;
  padding: 14px 16px;
  text-decoration: none;
  font-size: 17px;
}

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

.topnav a.active {
  background-color: black;
  color: white;
}

.summary {
    font-family: Sans-Serif;
    font-size: 20px;
    
}

 .table, th, td {
  border: 1px solid black;
}

a:link {
  background-color:gray;
  color: black;
  padding: 15px 15pxpx;
  text-align: center;
  display: center;
  font-size: 15px ;
}

a:hover, a:active {
  background-color: red;
}