html {
  font-family: 'Trebuchet MS', 'Lucida Sans Unicode', 'Lucida Grande', 'Lucida Sans', Arial, sans-serif;
}

html, body {
  width: 100%;
  height: 100%;
  margin: 0;
  box-sizing: border-box;
}

body {
  position: relative;
}

.center {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}

ul {
  margin: 0;
  padding: 0;
}

li {
  list-style: none;
}

a, a:visited {
  color: darkcyan;
}

a:hover, a:focus {
  color: darkolivegreen;
}