I Created a Proton Dark theme

[SeanGSR]

Proton Dark a dark purple theme inspired by Proton's UI

Custom CSS to add with the Theme:

/* Proton Theme by Loading... */
.main-pane-container,
[class*="mainPaneContainer"] {
  background: radial-gradient(ellipse at 50% 0%, #221850 0%, #191333 35%, #0e0d12 70%) !important;
}
::-webkit-scrollbar {
  width: 6px;
}
::-webkit-scrollbar-thumb {
  background: #413085;
  border-radius: 3px;
}
::-webkit-scrollbar-track {
  background: transparent;
}
[class*="serverItem"]:hover,
[class*="channelItem"]:hover,
[class*="memberItem"]:hover,
[class*="drawerItem"]:hover {
  background: rgba(191, 181, 233, 0.12) !important;
}
[class*="pane"],
[class*="header"] {
  border-color: rgba(65, 48, 133, 0.3) !important;
}
a, [class*="link"] {
  color: #8a6eff !important;
}
a:hover, [class*="link"]:hover {
  color: #a78bfa !important;
}
[class*="input"]:focus,
[class*="textArea"]:focus {
  box-shadow: 0 0 0 2px rgba(109, 74, 255, 0.3) !important;
}
[class*="serverItem"] img,
[class*="serverAvatar"] {
  box-shadow: 0 2px 5px rgba(74, 45, 197, 0.04),
              0 8px 22px rgba(74, 45, 197, 0.17),
              0 20px 68px rgba(74, 45, 197, 0.11);
}