Form cut on the right (widget I think)

Hi guys, 

I gotta an issue with this form : 

https://form.jotformeu.com/73310817188357

When I put it on my website, on computer with 17" screen, no problem, but when it comes to 15" or worse 13", it is cut like below : 

Can you help me on that ? 
Thanks guys

I have added this custom CSS to your form.

.form-all {

  max-width: 100%;

  box-sizing: border-box;

}

iframe {

  max-width: 100%;

}

and this to the widget

li {

max-width: calc(20% - 20px) !important;

box-sizing: border-box;

}

img {

max-width: 100% !important;

}

Here is how the form looks on a 13 inch screen:

Let us know if you need further help.

Thanks a lot for your help, it works on small computer screen but mess up the view on mobile phone (it worked perfectly on mobile before), have a look below : 

Is there a way to adapt following the size of the screen ? 

I put the CSS code of the widget inside a media query, so it does not affect smaller screens (mobiles).

The form should look good on mobiles and desktops now.

Let us know if you need further assistance.