Please anyone help , Wordpress css

I am new to coding but thought I would watch few videos and also check the internet . I have been learning the header.php and footer.php also created a sidebar.php I am struggling on what to do on my style sheet css. I tried few things but when I try do child theme plugin to check theme its showing errors with my css.
Here is what I put any ideas or even suggestions please be gentle with me lol I am new.

body { text-align: center; }
#wrapper { display: block; border: 1px #a2a2a2 solid; width:90%; margin:0px auto; }
#header { border: 2px #a2a2a2 solid; }
#content { width: 75%; border: 2px #a2a2a2 solid; float: left; }
#sidebar { width: 23%; border: 2px #a2a2a2 solid; float: right; }
#delimiter { clear: both; }
#footer { border: 2px #a2a2a2 solid; }
.title { font-size: 11pt; font-family: verdana; font-weight: bold; }

Afraid no direct response to this, but if you’re looking to create a theme from scratch I’d recommend _s ( - I started with their template having no knowledge of the underlying structure of Wordpress and it was fairly easy to come up with a custom layout.

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Thanks for the reply yeah I will go check it out thanks