<!DOCTYPE html>
<html>
<meta name="viewport" content="width=device-width, initial-scale=1">
<head>
<style>
body, html {
    width: 100%;
    height: 100%;
    margin: 0;
}

img {
    opacity: 0;
    transition: opacity 1s ease-in-out;
}

div, img {
    width: 215px;
    height: 174px;
    position: absolute;
    top: 0;
    left: 0;
}

div {
    background: red;
}
</style>
<script>
addEventListener("load", () => {
    setTimeout(() => document.querySelector("img").style.opacity = 1, 500);
});
</script>
</head>
<body>
<div></div>
<img src="icon.png"></img>
</body>
</html>