Use $primary-content

Signed-off-by: Šimon Brandner <[email protected]>

Author: SimonBrandner

res/themes/dark/css/_dark.scss

@@ -182,7 +182,7 @@ $video-feed-secondary-background: $system;
 // ********************
 $kbd-border-color: $menu-border-color;
 $visual-bell-bg-color: #800;
-$avatar-initial-color: #ffffff;
+$avatar-initial-color: $primary-content;
 $theme-button-bg-color: #e3e8f0;
 $codeblock-background-color: #2a3039;
 $resend-button-divider-color: rgba($header-panel-text-primary-color, 0.74); // muted-text with a 0.74 opacity.