title: Material UI v1 - set table column widths
body: <p>I want to set column widths on a Material UI table using css (not inside react using "classes").
  But I don't understand how the column widths are controlled. I try to set widths on the TH columns but it doesn't work.</p>
  
  <p>See example:
  <a href="https://codesandbox.io/s/y2qm07xw6z" rel="noreferrer">Material ui table example</a>      (See style.css)</p>
  
  <p>I don't understand how the table column widths are controlled on the "<strong>Simple Table</strong>" on the Mui table: <a href="https://material-ui.com/demos/tables/#simple-table" rel="noreferrer">Simple table</a> (you can see that the first column is wider than the others. How?)</p>
  
  <p>So how does it work, and how can I modify the settings?</p>