Testimonials-slider. Spaghetti code and all sorts of disaster

Hello Mentors,

It seems like I really straggle with positioning elements. My code is full of hard-coded sizes, widths and heights. Mostly units are px's and %'s . Moreover all the numbers aren't even whole numbers e.g "margin-left: 214.756 px" , "padding-top: -49.589%" etc....
At the end it's close to the .sketch designs at required screen sizes, but somewhere between.... it's a complete disaster. Nothing is fluid or responsive.

Trying to use min, max widths but it makes the matter even worse.

Please advise! Help needed