style.css

.topnav {
  background-color: #0b00a8;
  overflow: hidden;
}

/* Style the links inside the navigation bar */
.topnav a {
  float: left;
  display: block;
  color: #f2f2f2;
  text-align: center;
  padding: 14px 16px;
  text-decoration: none;
  font-size: 17px;
}

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

/* Add an active class to highlight the current page */
.topnav a.active {
  background-color: #0091ff;
  color: white;
}

/* Hide the link that should open and close the topnav on small screens */
.topnav .icon {
  display: none;
}

body { margin: 0; padding: 0; }

@@ -33,14 +33,16 @@
      .theGrid {
        height: 2.75%;
      }
      @media (max-resolution: 199dpi) {
      @media (min-width: 501px) {
        .theGrid #scaletest {
          /* This adds an underline *solely* for debugging purposes, specifically
             to test if this code is run on mobile devices. */
          text-decoration: underline;
        }
      }
      @media (min-resolution: 200dpi) {
      @media (max-width: 500px) {
        .theGrid {
          grid-template-columns: 3fr 7fr 3fr;
        }
        
ul {
  list-style-type: none;
  margin: 0;
  padding: 0;
  overflow: hidden;
  background-color: #333;
}

li {
  float: left;
}

li a, .dropbtn {
  display: inline-block;
  color: white;
  text-align: center;
  padding: 14px 16px;
  text-decoration: none;
}

li a:hover, .dropdown:hover .dropbtn {
  background-color: red;
}

li.dropdown {
  display: inline-block;
}

.dropdown-content {
  display: none;
  position: absolute;
  background-color: #f9f9f9;
  min-width: 160px;
  box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.2);
  z-index: 1;
}

.dropdown-content a {
  color: black;
  padding: 12px 16px;
  text-decoration: none;
  display: block;
  text-align: left;
}

.dropdown-content a:hover {background-color: #f1f1f1;}

.dropdown:hover .dropdown-content {
  display: block;
}