body {
  background: #181b2d;
  color: white;
  margin: 0;
}

menu {
  padding: 0;
  text-align: center;
}

menu ul {
  padding: 0;
}

menu ul li {
  display: inline-block;
}

header {
  text-align: center;
  background: #282b3d;
}

header div {
  display: inline-block;
  border-width: 3px;
  border-style: groove;
  border-radius: 10px;
  margin: 3px;
  padding: 3px;
  border-color: yellow;
}

main {
	text-align: justify;
	background: #282b3d;
}

h1,h2,h3 {
  text-align: center;
}

a {
  color: yellow;
  background-color: #282b3d;
}

a:link {
  background-color: #282b3d;
  color: yellowgreen;
}

a:hover {
  color: green;
  background-color: #282b3d;
}

a:visited {
  color: lightblue;
  background-color: #282b3d;
}