<button id="live-chat">실시간 채팅 💬</button>
#live-chat {
  position: fixed;
  bottom: 20px;
  right: 20px;
  
  border: none;
  border-radius: 16px;
  background: royalblue;
  color: white;
  padding: 12px;
  font-weight: bold;
  box-shadow: rgba(0, 0, 0, 0.35) 0px 5px 15px;
  cursor: pointer;
}

body {
  height: 200vh;
}

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