html - 如何在之前添加z-index？

Question

每个 div 都应该有一个箭头。我想要这样的东西:

关于我该怎么做的任何建议？

div {
  position: relative;
  background-color: #008000;
  padding: 0px 16px;
  height: 40px;
  line-height: 40px;
  display: inline-block;
  color: white;
  border: 2px solid black;
  border-right: none;
  z-index: 1;
  margin-right: -5px;
}

div:before {
  content: '';
  position: absolute;
  left: 100%;
  z-index: -1;
  width: 28px;
  height: 28px;
  background-color: #008000;
  border-right: 2px solid black;
  border-bottom: 2px solid black;
  transform: rotate(-45deg) translate(-14px, -7px);
}

<div>arrow with border</div>
<div>arrow with border</div>
<div>arrow with border</div>

Answer 1

希望这对您有所帮助。

ul {
    margin: 20px 60px;
}

ul li {
    display: inline-block;
    height: 30px;
    line-height: 30px;
    width: 100px;
    margin: 5px 1px 0 0;
    text-indent: 35px;
    position: relative;
}

ul li:before {
    content: " ";
    height: 0;
    width: 0;
    position: absolute;
    left: -2px;
    border-style: solid;
    border-width: 15px 0 15px 15px;
    border-color: transparent transparent transparent white;
    z-index: 0;
}

ul li:first-child:before {
    border-color: transparent;
}

ul li a:after {
    content: " ";
    height: 0;
    width: 0;
    position: absolute;
    right: -15px;
    border-style: solid;
    border-width: 15px 0 15px 15px;
    border-color: transparent transparent transparent darkgray;
    z-index: 10;
}

ul li.active a {
    background: green;
    z-index: 100;
}

ul li.active a:after {
    border-left-color: green;
}

ul li a {
    display: block;
    background: darkgray;
    text-decoration: none;
}

ul li a:hover {
    background: blue;
    color: white;
}

ul li a:hover:after {
    border-color: transparent transparent transparent blue;
}

<ul>
    <li><a href="#">Foobar</a></li>
    <li class="active"><a href="#">Foobar</a></li>
    <li><a href="#">Foobar</a></li>
    <li><a href="#">Foobar</a></li>
</ul>