LearnDash 3.0 - Focus Mode - Course Navigation - Customize the expand/collapse arrow links

learndash-3-focus-mode-navigation-expand-arrows.css

/**
 * This only works when using the LearnDash 3.0 template.
 * 
 * Use the following CSS to apply a specific background color to the circle
 * around the arrow, and then change the color of the arrow itself.
 *
 * These styles should be copied & pasted to a child theme or the "Additional CSS"
 * area of the WordPress Customizer.
 *
 * Use your own color values for both background-color and color.
 */

.learndash-wrapper .ld-course-navigation .ld-lesson-item-preview .ld-expand-button .ld-icon {
	background-color: #000;
	color: #fff;
	opacity: 1;
}

Thank you for your help!
But let me know more.
I add shortcode on editor of lesson in admin panel. Please see

my screenshot!

But I can't see change of progression in page.
Progression icon don't change.

Please help me!

If you are a expert for learndash, I will hire you

1. I don't think that's a valid shortcode.
2. It looks like you've customized the LearnDash focus mode. I also can't see if there are buttons below your video. There should be.
3. I am an expert but I'm not available for hire.

Good luck with your project.

Hey member of learndash center!
I want auto complete of lesson after watching video.
No need complete lesson button.
Do you understand me?
For best using of learndash, please help me!

Sorry, I'm all out of help. Good luck.