轮播淡入淡出黑色效果

Question

我想知道如何将淡入淡出的颜色而不是白色更改为黑色？我正在使用引导程序 4.1

<link href="https://cdnjs.cloudflare.com/ajax/libs/bootstrap-slider/10.2.0/css/bootstrap-slider.css" rel="stylesheet" />
<script src="https://cdnjs.cloudflare.com/ajax/libs/bootstrap-slider/10.2.0/bootstrap-slider.js"></script>
<div id="carouselExampleIndicators" class="carousel slide carousel-fade" data-ride="carousel">
<ol class="carousel-indicators">
<li data-target="#carouselExampleIndicators" data-slide-to="0" class="active"></li>
<li data-target="#carouselExampleIndicators" data-slide-to="1"></li>
<li data-target="#carouselExampleIndicators" data-slide-to="2"></li>
</ol>
<div class="carousel-inner">
<div class="carousel-item active">
<div class="gradient">
<img class="d-block w-100" src="https://www.sample-videos.com/img/Sample-jpg-image-500kb.jpg" alt="First slide">
</div>
</div>
<div class="carousel-item">
<div class="gradient">
<img class="d-block w-100" src="https://www.sample-videos.com/img/Sample-jpg-image-500kb.jpg" alt="First slide">
</div>
</div>
<div class="carousel-item">
<div class="gradient">
<img class="d-block w-100" src="https://www.sample-videos.com/img/Sample-jpg-image-500kb.jpg" alt="First slide">
</div>
</div>
</div>
</div>

Answer 1

这是不可能的，因为这种颜色来自不透明度，而不是 img 的背景色。