Fix CT/VM chart background

PVEDiscordDark/sass/PVEDiscordDark.css

@@ -688,6 +688,10 @@ div[id^="pveDcSummary-"][id$="-innerCt"] > div:nth-child(4) > div:nth-child(3) {
   border: 1px solid #23272a;
 }
 
+div[id^="proxmoxRRDChart-"] > div:nth-child(3) > div {
+  background-color: #23272a;
+}
+
 #toolbar-1069-innerCt {
   background: #2c2f33;
 }

PVEDiscordDark/sass/PVEDiscordDark.sass

@@ -26,6 +26,7 @@
 @import './x/_boundlist.sass';
 
 @import './proxmox/_pveDc.sass';
+@import './proxmox/_proxmoxRRDChart.sass';
 
 @import './special/_specific.sass';
 @import './special/_icons.sass';

PVEDiscordDark/sass/proxmox/_proxmoxRRDChart.sass

@@ -0,0 +1,2 @@
+div[id^="proxmoxRRDChart-"] > div:nth-child(3) > div
+    background-color: #23272a