a11y issue removed

Author: userjoergjakoby

src/app/ui-components/first-page/first-page.component.scss

@@ -70,12 +70,11 @@
     }
 
     dialog[open] {
-      background-color: darkgray;
       &::backdrop {
-        background-color: darkgray;
+        background-color: rgb(0 0 0 / 25%);
       }
       button {
-        color: gray;
+        color: black;
       }
     }