Building a theme switcher has never been easier since the introduction of modern CSS variables. If you've been a Sass advocate you likely understand the point of a variable in your CSS code.
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I have a new course called Hello Rails. Hello Rails is modern course designed to help you start using and understanding Ruby on Rails fast. If you're a novice when it comes to Ruby or Ruby on Rails I invite you to check out the site. The course will be much like these builds but a super more in-depth version with more realistic goals and deliverables. View the course!