Resolve ccs conflict problems between theme css and custom php script css

We have css conflict problems between the css of a html theme template and the css of a booking script that is installed in the script. We need to resolve these css conflict problems The conflict problems exist in the theme pages and also in the booking steps of the script. Step 1 is the booking form in home page. Step 2 is choosing car. Step 3 is choosing extra, Step 4 is fill personal data. Also we need you to create 5 different booking forms for the home page of the theme. The booking form is generated from the php script and needs html and css in order to look the way we want. We need to be able to choose the booking form that we want (one booking form will be chosen per time). This means different html and css files for each form. The job can’t be done on local host. You have to change the css files (front css & style css and upload them with ftp in order to see changes) Totally we want this job to be done in 5 themes. We will start with one theme and if everything goes fine we can proceed with the rest themes. We can provide: Jpg and ai files of how the booking forms have to look like ftp access to the installed theme and script html template of the theme / themes screenshots of where each booking form has to be the placed in the home page live view from other sites (other templates with no conflict issues) of how step2, 3 and 4 of the booking script have to look after the resolve of the css conflict problems.