相关疑难解决方法(0)

.bubble {
  height: 100px;
  width: 200px;
  border: 3px solid gray;
  background: lightgray;
  position: relative;
  cursor:pointer;
}
.triangle {
  width: 0;
  border-top: 20px solid black;
  border-left: 20px solid transparent;
  border-right: 20px solid transparent;
  cursor:pointer;
}

<div class="bubble">Speech bubble
</div>
<div class="triangle">
</div>