body {
  margin: 0;
  font-family: Arial, Helvetica, sans-serif;
}

 /* Add a black background color to the top navigation */
.topnav {
  background-color: #000000;
  overflow: hidden;
}

/* Style the links inside the navigation bar */
.topnav a {
  float: left;
  display: block;
  color: #f2f2f2;
  text-align: center;
  padding: 6px 16px;
  text-decoration: none;
  font-size: 15px;
}

/* Change the color of links on hover */
.topnav a:hover {
  background-color: #333333;
  color: #ffff00;
    	-webkit-border-radius: 3px 3px 0 0;
	-moz-border-radius: 3px 3px 0 0;
	border-radius: 3px 3px 0 0;
}

/* Add an active class to highlight the current page */
a.active {
  background-color: #ffff99;
  color: #333300;
  	-webkit-border-radius: 3px 3px 0 0;
	-moz-border-radius: 3px 3px 0 0;
	border-radius: 3px 3px 0 0;
}

.topnav .icon {
  display: none;
}

@media screen and (max-width: 600px) {
  .topnav a:not(:first-child) {display: none;}
  .topnav a.icon {
    float: right;
    display: block;
  }
}

@media screen and (max-width: 600px) {
  .topnav.responsive {position: relative;}
  .topnav.responsive .icon {
    position: absolute;
    right: 0;
    top: 0;
  }
  .topnav.responsive a {
    float: none;
    display: block;
    text-align: left;
  }
}