Explore the potential drawbacks of using CSS frameworks like Bootstrap in a 23-minute conference talk from View Source Berlin 2016. Discover why third-party frameworks might not be the best choice for your project, whether it's a theme or a custom website. Learn techniques for crafting a blog theme without relying on frameworks, covering everything from layout to individual UI components. Gain insights from Belén Albeza, an engineer and game developer working in Developer Relations at Mozilla, who shares her expertise on web standards, high-quality code, and accessibility. Understand the costs associated with using CSS frameworks, including large CSS files, unused styles, and maintenance challenges, and consider alternative approaches for more efficient and maintainable web development.