Financial information feeds such as the Share price, RNS, Interactive charts are provided by Euroland.
In regards to the content and design, we do not control ether. We can request design changes if needed though.
The interactive charts use Euroland's auto height functionality which makes the iframe's responsive. This can be seen in the below examples.
The auto height functionality is called an initialised within the FinancialInformationFeed.js file.
For any new interactive charts, add the iframe html code into the "Financial information feed" grid property, assign the iframe a unique ID, then update the FinancialInformationFeed.js file accordingly.