This tutorial will show you how to make a block fill the full width in Drupal 7.x
Log into your Drupal administration panel and navigate to Appearance > Settings > themeXXX (where themeXXX is your actual theme number):
Choose Regions Settings option – there you will see available regions to make a block fullwidth:
You should check Fullwidth option to make this region fullwidth (e.g. remove grids).
Click Save configuration button and refresh your site to see changes.
Feel free to check the detailed video tutorial below: