h1 {
  color: green;
  text-align: center;
  padding: 10px;
  margin-top: 20px;
  margin-right: 200px;
  margin-bottom: 20px;
  margin-left:200px;
}
ul {
  list-style-type: none;
  margin: 10;
  width: 200px;
  background-color: yellow;
  position: center;
}

nav li {
  display:inline-block;
    position: center;
}
ul a {
  display: inlineblock;
  padding: 8px 10px;
}
ul a:hover {
  background-color: pink;
  color:green;
}
body {background-color: grey;}

h1 {
  border-style: solid;
  background-color: yellow;
}

div {
  border: double;
}
section {
background-color: pink;
}