Css-float Questions

I'm trying to get a dynamically sized sidebar to float in the upper right portion of my web pages (but below the header and nav) and have the main

I am doing a program with a list of elements (float or flex) that might have a display of "none", that can change dynamically. i manage to do it

New to css and html, i am trying to build a simple site that shows 5 images next to each other, that re-scale when the window is resized. what i

Many front-end developers know that valid html has a positive effect on seo. but does a valid css affect seo? on the google website on the

I have a section on the very top of the page where it shows these items: search (shown on the top left), login/signup (each are linked to login page or signup page; shown