我正试着让覆盖层淡入，但现在它是一个即时的变化
超文本：

<div class="image-container">
    <img src="https://basicfishkeeping.com/wp-content/uploads/2023/01/Freshwater-Aquatic-Background-7.png" class="before">
    <img src="https://basicfishkeeping.com/wp-content/uploads/2023/01/Freshwater-Aquatic-Background-8.png" class="after">
</div>

CSS：

.image-container {
    position: relative;
    width: 250px;
    height: 250px;
}
.image-container .before {
    width: 100%;
    height: 100%;
}
.image-container .after {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: none;
    opacity: 0;
    transition: 0.5s;
}
.image-container:hover .after {
    display: block;
    opacity: 1;
}

尝试在Wordpress上运行它，并立即更改为第二个图像，而不是淡入淡出