First you need to create a file or directory in the plugins directory
Let show you a test plugin
Create a file name test-plugin.php in the plugins directory
Enter the below content in the file
Plugin Name: Test Plugin
Description: This is just a test plugin to print "Hello world! Plugin is running!
Plugin URI: https://www.shahrukhdeveloper.com
Version: 1..1 or something
License: GPLv2 or later
The filter css property is used to apply a graphical effects to an element like bluring or color shifting. Filters are commonly used to adjust the rendering of images colors, background, borders etc.
There are many available properties in css to achieve filter effects.
Filter: none Filter: blur() filter: brightness() filter: contrast() filter: drop-shadow() filter: grayscale() filter: hue-rotate() filter: invert() filter: opacity() filter: saturate() filter: sepia() filter: url();
Custom property defined in css that contain a specific values to be reused throughtout the document. In a large website there is a large amount of css code with a lot of repeated values. The same color can be used 2 or more places or even hundreds of different places. So Custom properties allow us to stored value in one place and reuse on other places.