Drag And Drop HTML Builder?

Hey guys, so I’m currently building a website for a client which is a Car repair shop.

They have a system in place which has provided a HTML code to allow customers to track there cars progress online however I have been asked to format/edit to make it more friendly and better fitting with the overall theme.

Im pretty rubbish with HTML so was wondering if anyone had any plugins, or downloadable/online software which would allow me to paste the HTML in, and then edit it in an easy enough way for me to understand (drag and drop).

Any help is appreciated, thanks so much.