Some help with CSS

[luckey]

This will remove the 3-dot button, but it will do so for all items on the server.
Shouldn't be an issue on the webUI with a mouse as you can right-click to bring up the same menu, but it may make it more difficult on a touch screen depending on how that works. 

Code:

span.material-icons.cardOverlayButtonIcon.cardOverlayButtonIcon-hover.more_vert {
    display: none;
}

Thank you so much! Exactly what I needed!

Did you enable the backdrop option in the client settings?
Click on your user profile on the top-right and then go to "Display".
Scroll down a bit and you will see settings for that.

Keep in mind that since these are client settings, they only apply to that single client (and you will need to redo them on new clients).
A browser counts as a single client.

Yes I did, I think the problem is that I'm using a custom background:

Code:

.backdropImage {
  display: none;
}

.backgroundContainer {
  background-color: rgba(0, 0, 0, 0);
  background-image: url('https://i.imgur.com/a4VdCjA.png');
  filter: blur(10px);
  background-size: cover;
}

This is how it looks when I remove that code: