Image not fading in? CSS-CodePudding

I'm trying to get the overlay to fade in but it's an immediate change now

HTML:

<div >
    <img src="https://basicfishkeeping.com/wp-content/uploads/2023/01/Freshwater-Aquatic-Background-7.png" >
    <img src="https://basicfishkeeping.com/wp-content/uploads/2023/01/Freshwater-Aquatic-Background-8.png" >
</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;
}

Tried running it on Wordpress and got the immediate change to the second image instead of a fade over

CodePudding user response：

The following making the fading-in a transition:

.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;
}

.after:hover {
    transition: 0.5s;
    opacity: 1;
}