What does it mean to have responsive design for your site? How can you tell if your existing site is responsive? This week we will begin with the theories behind the "mobile-first paradigm" - the idea that your mobile site should provide everything needed, not a pared-down version of a good page. We end the week by taking the first concrete step of using fluid measurements in your CSS.

This week you will get a chance to put the theories into practice using media queries in your CSS. These queries can automatically change the look and functionality of your site based on the size of the browser being used to view the page. This allows you to decide what type of look you want to achieve at various screen sizes, also called "viewports".

Knowing what your want your site to look like is the first step, but actually writing the code is another. This week we look at the grid and flex display properties to suggest ways to organize the layout of your page. We also talk about media queries that you should be including to increase the accessibility of your page. These queries can react to user preferences about color schemes, animation, and more.

After every good programmer has put in time creating sites from scratch, it is common to utilize existing tools out there. After all, why recreate the wheel? The work you have done up to this point will give you the knowledge needed to craft your own unique sites from these frameworks. This week we will work with Bootstrap, a framework that uses HTML5, CSS, and JavaScript (but don't worry if you have never used JavaScript yourself).