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;
  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;
  padding-top: 24px;
}