html, body {
    height: 100%;
background-color:black;
}

html {
    display: table;
    margin: auto;
}

body {
    display: table-cell;
    vertical-align: middle;
}
div #my_list {
  width: 400px;
}
 
h2 {
  font: 400 40px/1.5 Helvetica, Verdana, sans-serif;
  margin: 0;
  padding: 0;
}
 
ul {
  list-style-type: none;
  margin: 0;
  padding: 0;
}
 
li {
  font: 200 20px/1.5 Helvetica, Verdana, sans-serif;
  border-bottom: 1px solid #ccc;
}
 
li:last-child {
  border: none;
}
 
li a {
  text-decoration: none;
  color: #AAA;
  display: block;
  width: 400px;
 
  -webkit-transition: font-size 0.3s ease, background-color 0.3s ease;
  -moz-transition: font-size 0.3s ease, background-color 0.3s ease;
  -o-transition: font-size 0.3s ease, background-color 0.3s ease;
  -ms-transition: font-size 0.3s ease, background-color 0.3s ease;
  transition: font-size 0.3s ease, background-color 0.3s ease;
}
 
li a:hover {
  font-size: 30px;
  background: #f6f6f6;
}