How to edit the default icon of Add Media button?

I am trying to replace the default Add Media icon in my Wordpress site. I searched for the same on the web and got this:

How to replace default icon on Add Media button?

This seems to work for the OP, and ofcourse should've worked for others too. But, I am getting confused as the answer contains words like Child Theme and all. I could understand the first part of the answer, but I lost the track when the answer talked about this:

wp_enqueue_style('my-css', get_stylesheet_directory_uri().'/css/my-admin.css'

From where did this part of the url came: '/css/my-admin.css. I searched in my database at the backend but couldn't find this particular file anywhere. I know this might be a silly thing to ask, but this is it. Can someone help in this regard?

Topic buttons icon css Wordpress

Category Web

1
answered at

this function get_stylesheet_directory_uri() return URI to current theme's stylesheet directory and /css/my-admin.css is path to their file which you can create in your theme directory example :

<link rel="stylesheet" type="text/css" id="my-css" href="https://yourdomain.com/wp-content/themes/yourtheme/css/my-admin.css">

this is the output of the code in your source

1
answered at

/css/my-admin.css is located in the current theme directory as specified from the return value of get_stylesheet_directory_uri() prepended to this path.

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