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In this post you’ll find source of fading background gallery written purely in CSS.
Check demo here: https://jsfiddle.net/fedek6/78mL1ora/
Here’s a method to create horizontal color fill preloader using svg, js and a bit of CSS. Enjoy: https://jsfiddle.net/fedek6/nd6huxkr/1/
This trick will help you place element inside its cointainer using absolute positioning. Very often you want to be very precise when placing elements. It is very hard/impossible when you anchor to entire window because browser resizing is messing everything up. To avoid this, simply set relative positioning to the wrapper element. Check demo.