CSS prevent from resizing at a point?

Hi all I am making a website and I am trying to make the width of the object to not overscale, i.e I have a body tag and I set the page width to 60% and that is fine and now I am trying to set min width of xx% so the elements will not go over each other and I am trying to stop the browser from going over that xx% and show all content on the page.

I hope someone understands what i am trying to do and will help me with this.

Thanks