html - CSS navigationsbar position fixed section go under -

I have created a small page with a navigation bar and a segment I navbarbar status: fixed; , but if I do this, then under section navigation bar, this is the problem.

  * {margin: 0 px; Padding: 0 pixels; Font-family: 'Oswald', without-serif; } Body {background color: RGB (29, 29, 29); Height: 2000px; } NAV {Width: 100%; Background color: RGB (14, 14, 14); Hidden flurry; Border bottom: 2px solid black; Margin-down: 5px; Status: fixed; Top: 0; } .nav-top-ul {font-size: 0px; Width: 9 30px; Margin: 0 px auto; } .nav-top-li {display: inline-block; } .nav-top-a {display: block; Font-size: 16px; Padding: 10px 20px; Color: #C1C1C1; Infection: all 0.5 s; Text-decoration: None; } .nav-top-a: hover {color: white; }. Left {float: left; } Section {margin: 0 px auto; Width: 9 30px; Background color: orange; }  

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