On the configuration pages for various projects, when there is a large running paragraph of text (no returns), the text box will continue extending horizontally in the browser until there is a return/new line in the text (see attached jenkins-long-textbox.PNG). The header (jenkins-header.PNG) and footer (jenkins-footer.PNG) will fit to the window size (jenkins-css-form.PNG), but everything in between (the body) will fit to this maximum width set by the longest text line in any <td> on the configuration (jenkins-css-table.PNG).

I've tested this issue across both latest versions of Chrome and Firefox, as well as with different adjusted browser window sizes. Using "Inspect Element", I inserted style on the above screen-captured "table" element that wrapped words (<table style="table-layout: fixed, width: 100%"> and <td style="word-wrap: break-word">), but it was messy and already at the limit of my CSS.