xmc/modular/collapsing_members/on.css

[class^="chat_"]
  > [class^="content_"]
  > [class^="container_"]:nth-child(2)
  > [class^="membersWrap_"],
[class^="chat_"] > [class^="content_"] > [class^="container_"]:nth-child(2),
[class^="chat_"] > [class^="content_"] > [class^="membersWrap_"] {
  width: 50px !important;
  min-width: 50px !important;
}

[class^="chat_"]
  > [class^="content_"]
  > [class^="container_"]:nth-child(2):hover,
[class^="chat_"]
  > [class^="content_"]
  > [class^="container_"]:hover
  > [class^="membersWrap_"],
[class^="chat_"] > [class^="content_"] > [class^="membersWrap_"]:hover {
  width: 240px !important;
  min-width: 240px !important;
}

[class^="chat_"]
  > [class^="content_"]
  > [class^="container"]
  > [class^="membersWrap_"],
[class^="chat_"] > [class^="content_"] > [class^="membersWrap_"] {
  min-width: 0;
  min-height: 100%;
  background-color: var(--background-secondary);
}

[class^="chat_"]
  > [class^="content_"]
  > [class^="container_"]
  > [class^="membersWrap_"]
  > [class^="members_"],
[class^="chat_"]
  > [class^="content_"]
  > [class^="membersWrap_"]
  > [class^="members_"] {
  width: 58px !important;
}

[class^="chat_"]
  > [class^="content_"]
  > [class^="container_"]:hover
  > [class^="membersWrap_"]
  > [class^="members_"],
[class^="chat_"]
  > [class^="content_"]
  > [class^="membersWrap_"]:hover
  > [class^="members_"] {
  width: 240px !important;
}

[class^="chat_"]
  > [class^="content_"]
  > [class^="container_"]
  > [class^="membersWrap_"]
  > [class^="members_"]
  > [class^="content_"]
  > [class^="membersGroup_"],
[class^="chat_"]
  > [class^="content_"]
  > [class^="membersWrap_"]
  > [class^="members_"]
  > [class^="content_"]
  > [class^="membersGroup_"] {
  height: 0 !important;
  padding-top: 12px;
}

[class^="chat_"]
  > [class^="content_"]
  > [class^="container_"]:hover
  > [class^="membersWrap_"]
  > [class^="members_"]
  > [class^="content_"]
  > [class^="membersGroup_"],
[class^="chat_"]
  > [class^="content_"]
  > [class^="membersWrap_"]:hover
  > [class^="members_"]
  > [class^="content_"]
  > [class^="membersGroup_"] {
  height: 40px !important;
  padding-top: 24px;
}