Looking for handy, high-contrast notifications

Pling.com - Libre Publishing
1

Hi everybody,
I hadn’t ever dealt with themes, and I really do not want to, because I do not care for looks very much; functionality is what matters to me.

But last months my gnome experience went worse, because notifications are no longer readable well on my machine. Grey characters on gray transparent background, black letters on very dark grey background - really annoying. These are my tweak tool settings:
https://owncloud.trolink.de/index.php/s/uEJMvcPCnoJfwg8

So - what should I do to get a functional appearance of my notifications?

Chers,
Wolf

GNOME Shell 3.27.91
ubuntu 18pre

2

add this to the theme’s gnome-shell/gnome-shell.css file:

.message-title {
    color: black;
    text-shadow: none;
    font-weight: normal; }

.message-content {
    color: black;
    text-shadow: none;
	padding: 8px; }