div.error_404{
  padding: 100px;  
}

div.error_404 h1{
  text-align: center;
}

div.content_text ol {
  counter-reset: item;
  padding: 0;
  margin: 0;
}

div.content_text ol li{ 
  display: block;
  position: relative;
  font-size: 20px;
  font-weight: bold;
  margin: 10px 0;
  padding-left: 40px;
}

div.content_text ol li ol li{
  font-size: 14px;
  font-weight: normal;
}

div.content_text ol li:before {
  content: counters(item, ".") " ";
  counter-increment: item;
  position: absolute;
  top: 0px;
  left: 0px;
}