Mix-blend-mode不影响任何组件

我试着在网上搜索各种答案，并尝试了所有解决其他人问题的方法，但我的CSS就是不想合作。

在这里你可以找到一个JSFiddle，我在那里重新创建了这个问题:我希望侧导航在黑色部分也可见。

HTML
<div class="sidenav">
<a href="#" class="selected">Section 1</a>
<a href="#">Section 2</a>
<a href="#">Section 3</a>
</div>
<div class="content">
<div>
<p>Some text<p>
</div>
<div class="blk">
<p>Some text<p>
</div>
<div>
<p>Some text<p>
</div>
</div>

CSS
.sidenav {
width: auto;
position: fixed;
z-index: 1;
top: 150px;
padding: 8px 0;
}
.sidenav a {
clear: both;
float: left;
position: relative;
left: -20%;
padding: 10px;
margin-bottom: 15px;
transition: 0.3s;
text-decoration: none;
text-align: right;
font-size: 24px;
border-style: solid;
border-width: 2px;
border-color: #0D0D0D;
border-radius: 0 5px 5px 0;
color: #0D0D0D;
mix-blend-mode: difference;
}
.blk {
background-color: #0d0d0d;
color: #ffffff;
}

你想要这样的东西吗?

html {
scroll-behavior: smooth;
background: #fff;
}
body {
margin: 0;
padding: 0;
width: 100%;
max-width: 100%;
background-color: #ffffff;
color: #0d0d0d;
}
/**********************************************/
.section {
width: 100vw;
max-width: 100%;
background-color: #ffffff;
text-align: center;
margin: 0;
padding: 15vh 0;
position: relative;
}
.blk {
background-color: #0d0d0d;
color: #ffffff;
}
/**********************************************/
.sidenav {
width: auto;
position: fixed;
z-index: 1;
top: 150px;
padding: 8px 0;
mix-blend-mode: difference;
}
.sidenav a {
clear: both;
float: left;
position: relative;
left: -20%;
padding: 10px;
margin-bottom: 15px;
transition: 0.3s;
text-decoration: none;
text-align: right;
font-size: 24px;
border-style: solid;
border-width: 2px;
border-color: #fff;
border-radius: 0 5px 5px 0;
color: #fff;
background-color: #000;
}
.sidenav a:hover {
left: -2px;
}
.sidenav a.selected {
left: -2px;
color: #000;
background-color: #fff;
cursor: default;
}

<!doctype html>
<html>
<head></head>
<body>
<div class="sidenav">
<a href="#" class="selected">&emsp;&emsp;Section 1</a>
<a href="#">&emsp;&emsp;Another Section</a>
<a href="#">&emsp;&emsp;Last One</a>
</div>
<div class="content" onclick="closeMenu()">
<div class="section" id="works">
<p>Some text<p>
</div>
<div class="section blk" id="works">
<p>Some text<p>
</div>
<div class="section" id="works">
<p>Some text<p>
</div>
<div class="section blk" id="works">
<p>Some text<p>
</div>
<div class="section" id="works">
<p>Some text<p>
</div>
</div>
</body>
</html>

你需要将mix-blend-mode添加到父元素sidenav中，然后更改a的背景，颜色和边框颜色

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