Add some dark mode tweaks (Stoker’s dark mode)

Author: iMattPro

styles/all/theme/abbc3_common.css

@@ -209,3 +209,10 @@
 		transform: translateY(-100%);
 	}
 }
+
+/* Stoker Dark mode tweaks */
+.phpbb-dark-mode .hc-box,
+.phpbb-dark-mode .abbc3-spoiler {
+	background: rgba(255, 255, 255, 0.05) !important;
+	border-color: rgba(255, 255, 255, 0.12) !important;
+}