如何消除css3斜切角引起的毛边问题-PHP中文网问答

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<style>
.slide_bar {
    width: 180px;
    position: absolute;
    z-index: 99;
    right: 30px;
    top: 700px;
}
.slide_bar ul li a {
    display: block;
    width: 185px;
    height: 36px;
    line-height: 36px;
    text-align: center;
    font-size: 18px;
    color: #fff;
}

.slide_bar ul li:hover a {
    color: #0d1656;
}

.slide_bar ul li:nth-child(odd) {
    background: #588efd;
    background: linear-gradient(-70deg, transparent 12px, #588efd 0) right,
    linear-gradient(70deg, transparent 12px, #588efd 0) left;
    background-size: 50% 100%;
    background-repeat: no-repeat;

}

.slide_bar ul li:nth-child(even) {
    background: #52b8ff;
    background: linear-gradient(-110deg, transparent 12px, #52b8ff 0) right,
    linear-gradient(110deg, transparent 12px, #52b8ff 0) left;
    background-size: 50% 100%;
    background-repeat: no-repeat;

}

</style>

<p class="slide_bar">
    <img src="" alt="导航图">
    <ul>
        <li class="check_on"><a href="#K12_1">咨询老师</a></li>
        <li><a href="#K12_1">1</a></li>
        <li><a href="#K12_1">2</a></li>
        <li><a href="#K12_1">3</a></li>
        <li><a href="#K12_1">4</a></li>
        <li><a href="#K12_1">5</a></li>
        <li><a href="#K12_1">6</a></li>
        <li><a href="#K12_1">7</a></li>
        <li><a href="#K12_1"><i class="icon icon_top"></i>TOP</a></li>
    </ul>
</p>
</body>
</html>

使用css3的线性渐变实现多边形边框，斜切那部分会有毛边，不是很美观，请问怎么解决？
css3 club斜切角文章