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1,045 bytes removed ,  16 July
remove advice to use floats, it's so 1980's (pre-CSS grid era); correct the WestCiv example; Introduce useful resources section
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].
== Useful Resources ==* [https://caniusedeveloper.mozilla.com is org/en-US/docs/Learn/CSS Learn CSS] from the site to go -to for browser support resource: Mozilla Developer Network (and MDN)* [https://caniuse.com/usage-table global browser usagecomparison]* [http://getbem.com/introduction/ BEM] the Block Element Modifier convention for CSS rules* [https://www.sitepoint.com/optimizing-css-performance/ 20 tips for optimizing CSS] (2018)by SitePoint
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== 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:
<source lang="css">
@media (min-width: 55em)
{
.main
{
float: left;
width: 65%;
margin-right: 5%;
margin-bottom: 1em;
}
 
.aside
{
float: left;
width: 30%;
margin-bottom: 1em;
}
}
</source>
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
https://github.com/russmaxdesign/example-layout-two-full