html {
  background-color: #121212;
  border: 3vh solid #121212;
  font-family: sans-serif;
  font-size: 2vh;
  color: white;
}

a:link, a:visited {
  background-color: #f44336;
  color: white;
  padding: 1px 1px;
  text-align: center;
  text-decoration: none;
  display: inline-block;
}

a:hover, a:active {
  background-color: red;
}