how to overlay on css code example

Example 1: div color overlay css

box-shadow: inset 0 0 0 2000px rgb(0 0 0 / 67%);

Example 2: html overlay django

{% for instance in object_list %}
    <div align="center">
        <a href="#overlay{{ instance.pk }}">{{ instance.international_title }}</a>
    </div>
    <div id="overlay{{ instance.pk }}">
    <p>{{ instance.international_short_description }}<p>
    </div>
{% endfor %}