randomEmoji.html

<span id="unwelt_smiley"> </span> <!-- put wherever you want -->
<script>
function random_smiley()
{
    let set = ["💚","🐣","🌱","🌿","🌳","🌻","🌞","☀","🥦","🌏","🌍","🌈"]

    let smiley = set[Math.floor(Math.random()*set.length)];
    document.getElementById("unwelt_smiley").innerHTML = smiley;
}

random_smiley();
</script>