body {
  background-color: mediumpurple;
  color: indigo;
  font-family: Verdana;
  margin: 10px 20%;
}
div {
  background-color: violet;
  border-width: 10px;
  border-color: violet;
  border-style: solid;
}

.center {
  display: block;
  margin-left: auto;
  margin-right: auto;
  width: 50%;
}

a:link {
  color: blue;
  background-color: transparent;
  text-decoration: underline;
  font-family: Verdana;
}

a:visited {
  color: indigo;
  background-color: transparent;
  text-decoration: underline;
  font-family: Verdana;
}