title: Bootstrap 4 Flexbox with Fixed and Flexible Width Columns
body: <p>Using Bootstrap 4 and Flexbox, how would you accomplish a 2 column layout with a fixed-width left column and a flexible right column?</p>
  
  <p>I don't see anything in the docs about how to achieve this... I could do it easily enough using vanilla CSS, but I feel like I should use Bootstrap since I'm already pulling it in.</p>