In Drupal 8, if you are using a sub-theme of Bootstrap, you can set it to use the full width of the browser. Navigate to the settings of your theme and then go to General > Container to check the Fluid container. This option will expand or shrink according to the width of the browser.
About the author
Xuan Ngo is the founder of OpenWritings.net. He currently lives in Montreal, Canada. He loves to write about programming and open source subjects.