如何用三角形做一个透明的泡泡聊天？

<div class="chat-bubble">
  <div class="triangle"></div>
  <div class="content">这是一个透明的泡泡聊天</div>
</div>

.chat-bubble {
  position: relative;
  width: 200px;
  height: 100px;
  background-color: transparent;
  border: none;
  border-radius: 10px;
  box-shadow: 0 2px 5px rgba(0, 0, 0, 0.2);
}

.triangle {
  position: absolute;
  top: 50%;
  left: -10px;
  width: 0;
  height: 0;
  border-top: 10px solid transparent;
  border-bottom: 10px solid transparent;
  border-right: 10px solid #fff;
  transform: rotate(90deg);
}

.content {
  padding: 10px;
  color: #fff;
}