vertically text for the label in the header column

I am trying to make a table with Vertical Text just on the header table.

Here is my CSS code:

table th.user {
  .rotate(90deg);
  position: relative;
  padding-top: 190px;
  top: -10px;
  right: 0px;
  width: 200px;
}

Here is the demo http://codepen.io/anon/pen/GnveJ

As you can see it works partially. I would like to have the columns (the cells of the column where there are the name) which width fits exactly the contents (about 50 px); the same as the pic I attached to this question.
Any idea what is the best way to make the css code or js code for this purpose?

Requirement:
I am using less and jquery