html {
  background-color: lightgray;
}

ul {
  list-style-type: none;
  margin: 0;
  padding: 0;
  overflow: hidden;
  background-color: #333;
  border-radius: 5px;
  font-family: Arial, Helvetica, sans-serif;
}

li {
  float: left;
  font-family: Arial, Helvetica, sans-serif;
}

li a {
  display: block;
  color: white;
  text-align: center;
  padding: 14px 16px;
  text-decoration: none;
  font-family: Arial, Helvetica, sans-serif;
}

/* Change the link color to #111 (black) on hover */
li a:hover {
  background-color: #111;
}
 .active {
  background-color: #04AA6D;
}

h1 {
  font-family: Arial, Helvetica, sans-serif;
  text-align: center;
  padding-top: 30px;
}

form {
  text-align:center;
  font-family: Arial, Helvetica, sans-serif;
}