the second method i mentioned is using inline css (in the html section), btw—if you want to write global css for your userpage, select it using .alert-info (also .alert-warning, .alert-danger, and .alert-success) and style it the same way. e.g:

.alert-info {
  background-color: #000;
  border-color: #555;
  color: #FFF;
}