Split Screen Code

Site URL: https://pivothealth.squarespace.com/

Password: pivot

I am trying to change a section so there is a 50% split with an image and text on the otherside

So it looks like my design:

I have tried adding code:

@media only screen and (min-width: 768px){
(data-section-id=”602d3054014f732b26afb7b8”)
  .section-background{width:50%!important; margin-left:50%!important;}}

but it doesn't change anything on the site?

Can someone help?

It looks like you solved this?