body {
  background-color: black;
  margin-left: 40px;
  font-family: courier, serif;
  font-size: 20px;
}

h1 {
  color: red;text-align:center;
  margin-left: 40px;
  }
p {
  color: white;text-align:left;
  margin-left: 40px;
  margin-right: 80px;
}
ul {
  list-style-type: none;
  margin: 0;
  padding: 0;
  overflow: hidden;
  background-color: black;
}
li {
  float: left;
}

li a {
  display: block;
  color: yellow;
  text-align: center;
  padding: 16px 16px;
text-decoration: none;	
}

li a:hover {
  background-color: green;
}
.active {
  background-color: #04AA6D;
}
.center {
  display: block;
  margin-left: auto;
  margin-right: auto;
  width: 20%;
}
.center50 {
  display: block;
  margin-left: auto;
  margin-right: auto;
  width: 50%;
}
.video {
  display: block;
  margin-left: auto;
  margin-right: auto;
  width: 50%;
}
.column {
  float: left;
  width: 50%;
  padding: 0px;
}
img {
  display: block;
  margin-left: auto;
  margin-right: auto;
}