* {
    color: black;
    font-family: arial;
    font-size: 20px;
}
h1 {
    font-size: 35px;
}
h2 {
    font-size: 25px;
}
a {
    color: blue;
}
table, th, td {
    border: 1px solid;
    border-collapse: collapse;
    vertical-align: top;
    text-align: left;
}
table {
    width: 80%;
    margin: 0 auto;
}  

body {
    margin: 0;
    padding: 0;
}

.content {
    margin: 2% 4%;
}

/* Add a black background color to the top navigation */ 
/* https://www.w3schools.com/howto/howto_js_topnav.asp */
.topnav {
    background-color: #333;
    overflow: hidden;
}
  
/* Style the links inside the navigation bar */
.topnav a {
float: left;
color: #f2f2f2;
text-align: center;
padding: 14px 16px;
text-decoration: none;
font-size: 20px;
}

/* Change the color of links on hover */
.topnav a:hover {
background-color: #ddd;
color: black;
}

/* Add a color to the active/current link */
.topnav a.active {
background-color: #1c6dc9;
color: white;
}