[New Member] Total Beginner's Problem, Teaching Myself for University Assignment

Hi everyone,

I am doing a project actually for a typography class, not a web development class. We are informed that we needed to teach ourselves CSS and HTML so we could view our layouts in a web browser. So obviously I have no idea what I am doing. I am trying to do this in my CSS:

* { margin:0;
padding:0
border: 0;
}

#nav {
position: fixed;
top: 0px;
width: 100%;
opacity: .8;
z-index: 1;

}

#fullscroll {

position; fixed;
top: 0px;
padding: 0;
max-width: 1280px;
z-index: -1;
}


However, my Safari web tool says that there was a network issue and it can't reload the file. Which is ridiculous, because my student index page (listing assignments) loads the same css & I copy & pasted everything to debug & figure out where the problem is, because I've been so frustrated with this whole thing. Because nothing is working.

Any help would be GREATLY appreciated.