Simply download a CSS file and replace the one in Bootstrap. No messing around with hex values.
Changes are contained in just two SASS files, enabling further customization and ensuring forward compatibility.
Themes are built for the latest version of Bootstrap. Version 4, version 3, version 2, and other releases are also available to download.
Bootstrap themes are released under the MIT License and maintained by the community on GitHub.
Before diving into fixes, understanding the root cause saves time. Based on user reports and developer patches, the black screen typically stems from:
Add these lines (or edit existing):
Bootswatch