Cascading Style Sheets is one of the primary technologies used in the web. CSS provides the style/appearance aspect of your HTML.
WestCiv provides some really useful tools and examples of CSS in action. For example, you can make an [http://www.westciv.com/tools/gradientsnustyle/index.html#background-image:%20linear-gradient(
90deg,%20#ffffff,%20#000000%2010px,#000000%2025px,#ffffff%2035px,#000000%2045px,#000000%2060px,#ffffff%2070px) 'equals' background effect].
caniuse. com is the site to go to for browser support ( and global usage)
== Example: mobile layout with 2 columns ==
A change to use percentages and 'em's instead of hard pixel widths or font size would achieve a more fluid layout. Basically, always use em for font size. Only use px when you know the exact dimensions of something (like setting a negative margin for a graphic)
To really get what you want (a responsive layout that is designed to work well in print and a variety of devices), you should use the 'media' selector, in combination with 'media queries' <ref>good list of various approaches at https://gist.github.com/dustinboston/3867516 </ref>
CSS like the following would be good:
@media (min-width: 55em)
Note how both columns are floated "left" which means that when your math or the browser isn't broken and the percentages <=100% they are side by side. This side-by-side layout is only applied to devices that have a screen width of 880 pixels <ref> 55em translates to 880px for the browser default font size of 16px. https://css-tricks.com/css-font-size/</ref>
Example at http://maxdesign.com.au/jobs/css-layouts/12-example-layout-two-full/ and source at