Custom Javascript in notice

hi i want to add this javascript code in notice only
no idea where to palce tried via adding custom js templete but not works tried to add in page_container but it will take over on whole site

JavaScript:

<script>
    document.addEventListener("DOMContentLoaded", function () {
        const matrix = document.getElementById("matrix");
        const characters = "ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789@#$%^&*";

        if (matrix) {
            for (let i = 0; i < 50; i++) {
                const...

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