rustdesk/src/ui/header.css

header div {
  word-wrap: normal;
}

header #screens {
  background: white;
  border: #A9A9A9 1px solid;
  height: 22px;
  border-radius: 4px;
  flow: horizontal;
  border-spacing: 0.5em; 
  padding-right: 1em;
  position: relative;
}

header #screen {
  text-align: center;
  margin: 3px 0;
  width: 18px;
  height: 14px;
  border: color(border) solid 1px;
  font-size: 11px;
  color: color(light-text);
}

@media platform == "OSX" {
  header #screen {
    line-height: 11px;
  }
}

header #secure {
  position: absolute;
  left: -10px;
  top: -2px;
}

header #secure svg {
  size: 18px;
}

header .remote-id {
  width: 80px;
  @ELLIPSIS;
  padding-left: 30px;
  padding-right: 4em;
  margin: * 0;
}

header span:hover {
  background: #f7f7f7;
}

@media platform != "OSX" {
header span:hover {
  background: #d9d9d9;
}
}

header #screen:hover {
  background: #d9d9d9;
}

header #secure:hover {
  background: unset;
}

header span:active, header #screen:active {
  color: black;
  background: color(gray-bg);
}

div#global-screens {
  position: relative;
  margin: 2px 0;
}

div#global-screens > div {
  position: absolute;
  border: color(border) solid 1px;
  text-align: center;
  color: color(light-text);
}

header #screen.current, div#global-screens > div.current {
  background: #666;
  color: white;
}

span#fullscreen.active {
  border: color(border) solid 1px;
}

button:disabled {
  opacity: 0.3;
}