在工具提示中显示的div顶部添加一个三角形？

这个问题在这里已经有了答案：

CSS三角形如何工作？ 18个答案

---

你可以这样做：

注意：删除overflow: auto; 来自.user-options

CSS

.user-options {
    background: none repeat scroll 0 0 #eeeeee;
    margin-top: 25px;
    padding: 0 0 0 10px;
    position: absolute;
    width: 125px;
    z-index: 999;
    border:solid #cccccc 1px;
    margin-left:-24px;
}

.user-options:after, .user-options:before {
    bottom: 100%;
    left: 50%;
    border: solid transparent;
    content: " ";
    height: 0;
    width: 0;
    position: absolute;
    pointer-events: none;
}

.user-options:after {
    border-color: rgba(238, 238, 238, 0);
    border-bottom-color: #eeeeee;
    border-width: 15px;
    margin-left: -15px;
}
.user-options:before {
    border-color: rgba(204, 204, 204, 0);
    border-bottom-color: #cccccc;
    border-width: 16px;
    margin-left: -16px;
}

在这里演示

---

我会用这个，取决于你是否想要一个三角形的边框。 如果是这样，你想同时使用:before和:after 。

.user-options {
  background: none repeat scroll 0 0 #eeeeee;
  margin-top: 25px;
  padding: 0 0 0 10px;
  position: relative;
  width: 125px;
  z-index: 999;
  border: solid #cccccc 1px;
  margin-left: -24px;
}
.user-options:before {
  content: "";
  position: absolute;
  border-style: solid;
  border-width: 10px 12px;
  border-color: transparent transparent red transparent;
  left: 15%;
  /* TOP IS DOUBLE THE HEIGHT OF THE BORDER */
  top: -20px;
}

<div class="user-options">
  <ul class="settings">
    <li><a href="home.html">JOHN DOE</a>
    </li>
    <li><a href="user-customization.html">My Playground</a>
    </li>
    <li><a href="myrules.html">Settings</a>
    </li>
    <li><a href="index.html">Logout</a>
    </li>
  </ul>
</div>

---

你可以采取以下的方式：

.user-options {
  position: relative;
  border: 10px solid #cccccc;
  top: 100px;
}
.user-options:after,
.arrow_box:before {
  bottom: 100%;
  left: 20%;
  border: solid transparent;
  content: " ";
  position: absolute;
}
.user-options:after {
  border-bottom-color: #cccccc;
  border-width: 30px;
}
.user-options:before {
  border-bottom-color: #cccccc;
  border-width: 30px;
}

<div class="user-options">
  <ul class="settings">
    <li><a href="home.html">JOHN DOE</a>
    </li>
    <li><a href="user-customization.html">My Playground</a>
    </li>
    <li><a href="myrules.html">Settings</a>
    </li>
    <li><a href="index.html">Logout</a>
    </li>
  </ul>
</div>

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