etherpad-lite/src/static/css/pad/chat.css

#chaticon, #chatbox {
  visibility: hidden;
  z-index: 400;
  position: absolute;
  bottom: 0px;
  right: 25px;
}
#chaticon.visible, #chatbox.visible {
  visibility: visible;
}
#chaticon {
  border-top-left-radius: 5px;
  border-top-right-radius: 5px;
  border: 1px solid #ccc;
  border-bottom: none;
}
.chat-content {
  width: 400px;
  height: 300px;
  border-top-left-radius: 5px;
  border-top-right-radius: 5px;
  display: flex;
  border: 1px solid #ccc;
  border-bottom: none;
  z-index: 401;
  background-color: #f7f7f7;
  flex-direction: column;
  transition: all 0.3s cubic-bezier(0.74, -0.05, 0.27, 1.75);
  opacity: .3;
  transform: scale(.5);
  transform-origin: 100% 100%
}
#chatbox.visible .chat-content{
  opacity: 1;
  transform: scale(1);
}

#chatbox.stickyChat {
  position: relative;
  width: auto;
  flex: 1 auto; /* take reminaning vertical space */
  height: auto;
  right: 0;
  display: flex;
}
#chatbox.stickyChat .chat-content {
  background-color: #f1f1f1;
  border-radius: 0;
  border: none;
  border-left: 1px solid #ccc;
  height: 100%;
  width: 100%;
}
#chatbox.stickyChat .chat-content .stick-to-screen-btn {
  display: none;
}
#chatbox.stickyChat.chatAndUsersChat .chat-content .hide-reduce-btn {
  display:none;
}

/* -- TITLE BAR -- */
#titlebar {
  font-weight: bold;
  padding: 5px;
}
#titlebar #titlelabel {
  margin: 4px 0 0 4px;
  display: inline;
  font-size: 1.4rem;
}
#titlebar .stick-to-screen-btn,
#titlebar .hide-reduce-btn {
  font-size: 25px;
  color: inherit;
  float: right;
  text-align: right;
  text-decoration: none;
  cursor: pointer;
}
#titlebar .stick-to-screen-btn {
  font-size: 10px;
  padding-top: 2px;
}

/* -- MESSAGES -- */
#chattext {
  background-color: white;
  overflow-y: auto;
  flex: 1 auto;
  height: 0; /* strange bug on firefox, if height is not set, the chattext grow bigger than the maximum height */
}
#chattext p {
  padding: 3px;
  overflow-x: hidden;
  word-wrap: break-word;
}
#chattext .time {
  float: right;
  font-style: italic;
  font-size: .85rem;
  opacity: .8;
  margin-left: 3px;
  margin-right: 2px;
}

/* -- INPUT BOX -- */
#chatinputbox {
  padding: 5px;
}
#chatinputbox #chatinput {
  width: 100%;
}


/* -- CHAT ICON -- */
#chaticon {
  background-color: #fff;
  cursor: pointer;
  display: none;
  padding: 5px;
}
#chaticon a {
  text-decoration: none
}
#chaticon #chatlabel {
  font-weight: bold;
  text-decoration: none;
  margin-right: 3px;
  vertical-align: middle;
}
#chaticon #chatcounter {
  font-size: .8rem;
  vertical-align: middle;
  margin-left: 5px;
}

/* -- LOAD MESSAGES -- */
.chatloadmessages
{
  margin-bottom: 5px;
  margin-top: 5px;
  margin-left: auto;
  margin-right: auto;
  display: block;
}
#chatloadmessagesbutton
{
  line-height: 1.8em;
}
#chatloadmessagesball
{
  display: none;
}

@media only screen and (max-width: 720px) {
  #chatbox {
    right: 0;
    bottom: 0;
    left: 0;
  }
  #chatbox .chat-content {
    width: 100%;
  }
}