Thalia newsmail not displaying properly in a small window

One-sentence description

When opening the Thalia newsletter via e-mail on a narrow screen, the e-mail clips at the right side.

Current behaviour

See capture below. While a scrollbar is being displayed at the bottom of the mail, you can't expect readers to scroll down and up again to read both parts of each sentence.

Capture

Expected behaviour

The width of the e-mail scales with the width of the container in a responsive way.

Steps to reproduce

  1. Open the Thalia newsletter in a mail client, or open the online version in a browser.
  2. Narrow the screen down. The scrollbar should appear at 744 pixels. Readability issues start at ~720 pixels.