Modern Web Design with HTML5, CSS3, and JavaScript - Creating Responsive Columns Using Cascading Style Sheets (CSS)

The video tutorial covers making a website mobile-friendly by using media queries to adjust column widths based on page size. It demonstrates setting breakpoints at 600 pixels and updating styling properties like background color and width. The tutorial also includes changing border colors using a color palette and introduces creating a navigation bar to enhance the website's appearance.

Why is it necessary to select each element individually when applying styles?

What considerations should be taken into account when updating the border color of divs?