Making this rounded design

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1

I want a simple design for my website.

I found a website online that I use often. It has a really cool and basic design. But I’m not that good with CSS and I’m not sure how they did it. I looked up corner designs but I couldn’t find anything that matched, and worked correctly without using a ton of images.

Does anyone know how to make this basic outline? Or are there any free templates online that anyone knows of? I can do the colors and stuff myself, but I can’t figure out the layout.

I attached screen shots.

2

Because it’s a fixed-width site, they can get away with a simple background frame image (see attached). There are other background images, but that gives a good example of what’s being done.

3

some tutorials abou good with CSS are needed

4

You can find lots of templatres at wordpress.com. Or if you want some good CSS lessons go to w3schools website.