* {
  margin: 0;
  padding: 0;
}

body {
  font-family: Verdana, Geneva, Tahoma, sans-serif;
  margin-top: 3em;
}

h1 {
	width: 100%;
	text-align: center;
}


canvas {
 width:800px;
 height:450px;
}

.block {
	max-width:90%;
	margin:5%;
	padding-top:4%;
<!--  background-color: #eee; -->
  margin-bottom: 20px;
  text-align: center;
}

.navbar {
  list-style: none;
  margin: 0;
  padding: 0;
  background-color: rgba(0, 0, 0, 0.7);
  color: #eee;
  text-align: center;
  position: fixed;
  width: 100%;
  top: 0px;
}

.navbar li {
  display: inline-block;
  padding: 15px;
}

.navbar li a {
  color: #eee;
  text-decoration: none;
}

.navbar li a.active {
  color: tomato;
}