Simple iframe
This module adds a field type for embedding iframes. It allows you to specify the source URL, width, and height of the iframe, with default width and height values customizable in field settings.
This module provides a new field type for displaying iframes.
The field provides only the most basic settings for an iframe display and nothing else: src, width and height.
If you are looking to set other attributes for the iframe you should check out the iframe module (https://www.drupal.org/project/iframe)
Rendering is done using a twig template. So it's easy to override to fit your needs.
By default the module allows you to set a default value for the width (default 100% for responsiveness) and height.
The defaults can be overridden in the field settings.