Interactivity > Matching Texts = 20% 80%

I would like to make sure on the page matching texts that the left column is narrow (only words are there) and the right column is wide (that's where the explanation that they have to match to the right concept is). Does anyone know the CSS code for this?

You could try something like the following:
div[class*="label"] {
width: 75% !important;
}
But it might need to be cleverer than that e.g. take account of mobile etc.
Also the above is only changing the draggable label width.
HTH
Ron