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How to use z-index in <a> tag?

I have the following html that I want it to be viewed exactly the opposite of what it looks like now, but I tried a lot and nothing works to be specific. I want link A to be at the top of the link and B one under it, and C one under B, and so on ... I tried to set a z-index for them, but it did not work. explain me your mistake.

HTML:

<html>
<head>
    <title>Test page</title>
    <link href="style.css" type="text/css" rel="Stylesheet" media="screen" />
</head>
<body>
    <div class="d1">
        <a href="#" class="a1" style="background-color: #000;">A</a>
        <ul class="b1">
            <li>
                <a href="#" class="a2" style="background-color: #222;">B</a>
            </li>
            <li>
                <a href="#" class="a2" style="background-color: #444;">C</a>
            </li>
            <li>
                <a href="#" class="a2" style="background-color: #666;">D</a>
            </li>
            <li>
                <a href="#" class="a2" style="background-color: #888;">E</a>
            </li>
        </ul>
    </div>
</body>
</html>

CSS

div.d1
{
    width: 100px;
    height: 160px;
    float: left;
    margin: 0 auto;
    padding: 10px 50px 15px 50px;

    background-color: Red;
}

a.a1
{
    display: block;
    width: 100px;
    height: 130px;
    float: left;

    margin: 0 auto;
    padding: 30px 0 0 0;
}
a.a1:hover
{
    color: Red;
}

ul.b1
{
    display: block;
    width: 100px;
    float: left;

    position: relative;
    left: 25px;
    top: -160px;

    list-style: none;
    margin: 0;
    padding: 0;
}
ul.b1 li
{
    display: block;
    width: 25px;
    height: 160px;
    float: left;
    z-index: -1;
}
ul.b1 li a.a2
{
    display: block;
    width: 100px;
    height: 130px;

    margin: 0 auto;
    padding: 30px 0 0 0;
}
ul.b1 li a.a2:hover
{
    color: Red;
}
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2 answers

You need to specify the positioning <a>, because for work z-indexit is required that the positioning be set to a value other than the staticeasiest to set its positionrelative

Example: http://jsfiddle.net/2JsvU/

a {
    position: relative;
    z-index: 5;
}
+7

z-index , position , . <a> position:relative;, z-index.

+1

Source: https://habr.com/ru/post/1767523/

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