Make the table of contents appear above the article image on mouseover.

which CSS should I insert? sorry but i can't understand.

Not CSS, but CSS class, I attached an article about how to add CSS class to the block:
https://wordpress.com/support/adding-additional-css-classes-to-blocks/

Please check the screenshot I attached in my last reply, let me know which part you don't understand.

yes that in the custom selector I have to enter .dynamic-entry-expert? which css class should i use?

.special-media-text-block {
background-image: linear-gradient(to bottom right, red, blue);
}

You don't need to use any CSS as you are using GB pro.

You just need to:

1. Add the CSS class to the dynamic content block.

2. Add the effect to the very outside container block, the settings were all in the screenshot I attached.

what should I write which CSS class?

my error. done.. thnx!!

Add the blog-dynamic-content class to the dynamic content block instead of the parent container block:
https://www.screencast.com/t/mIfwnuQ5d7Gz

The effect setting for normal state is correct, but make sure it's .blog-dynamic-content with the . , as I can't see it in your screenshot.

You'll need to add another effect to the same container block/ same custom selector on hover state.

Great! Just saw your last reply.

Glad to hear that :)

if i wanted to change the background hover color of the dynamic content how should i do? other than the color of the text?

it's correct?

Based on this screenshot, you added to the container block which contains the dynamic content block.

In that case, you can set background color for the container block.

sorry but I'm lost again. .blog-dynamic-content with the dot is correct where did I put it?

i tried to change the background of the container it told me. but it does not work.

.blog-dynamic-content with the dot is correct where did I put it?

The class with dot is to be put in the Effect > Custom Selector.

I don't understand what it's for. Regardless of whether there is, nothing changes.

ok yes, in effect the . is inserted.