[BUG] Upcoming lectures: overlapping elements during animation

[Garfield96]

Describe the bug
On the "Home" page, if there are multiple upcoming lectures and the user clicks on the "Show X more ..." button, the text of the button overlaps with the upcoming lectures during the animation (see screenshot).

To Reproduce
Steps to reproduce the behavior:

1. Go to "Home" page
2. Click on "Show X more ..." button
3. See error

Expected behavior
The background of the "Show X more ..."/"Hide" button shouldn't be transparent to avoid this overlapping effect.

Screenshots

Smartphone :

• Phone: Redmi Note 8 Pro
• OS version: 11 RP1A.200720.011
• Language: German

Additional context
None