Cascading Style Sheets

Hide menu home slider and active it when page scroll down ?

Hide menu home slider and active it when page scroll down

Flipping card in CSS ?

I was asked to create a flipping card and I want to do one without automatic rotation. I want it to rotate after clicking but I have no idea how to do this, I'm thinking I have to use transform:rotateY(180deg) Any pointers? Thank you!

My css messes when zooming etc

I am a first year student in comp sci so I have the very basics of html and css down, but someone has asked me to make a site for them so I tried. The problem I am having with the layout which goes absolutely haywire when I zoom in/out or inspect the site on the mobile devices in chrome. And also I find that white space in the site looks off and I am not sure what to do there.

Slider/Carousel where image is sliced into sections

I am not new to CSS, but I have not been able to find anything about this on Google so I thought maybe I was using the wrong terminology.

I am looking to teach myself how to make a slider/carousel where the image is sliced into pieces and each slice is shifted off independently, revealing the image below as they "fly" off the screen.

I don't know how to describe this so Google will help me find the technology behind it.

Maybe it is actually done in Javascript more than CSS... I don't know.

Newbie help with someone elses CSS

I am not very good at CSS yet. I am trying to change a web page to suit our needs. The guy who created it started with someone else's template which is at;
https://html5up.net/twenty

There are parts of the page I am not fond of. He has buttons to go to outside pages, we need about six. They have large graphics and only two across. I want smaller graphics and four across. I put a sample of the HTML below.

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