CSS解决网页导航条绝对地固定在浏览器上端保持不动

[{"title":"（ 9 个子文件 904KB ） CSS解决网页导航条绝对地固定在浏览器上端保持不动","children":[{"title":"导航条绝对固定在浏览器上端不动","children":[{"title":"图例1.PNG <span style='color:#111;'> 128.32KB </span>","children":null,"spread":false},{"title":"Default.aspx <span style='color:#111;'> 3.45KB </span>","children":null,"spread":false},{"title":"Styles","children":[{"title":"MainPageCenter.css <span style='color:#111;'> 137B </span>","children":null,"spread":false},{"title":"NavigationBar.css <span style='color:#111;'> 3.47KB </span>","children":null,"spread":false}],"spread":true},{"title":"Images","children":[{"title":"Nav_hover.png <span style='color:#111;'> 338.97KB </span>","children":null,"spread":false},{"title":"Nav_out.png <span style='color:#111;'> 337.96KB </span>","children":null,"spread":false}],"spread":true},{"title":"web.config <span style='color:#111;'> 266B </span>","children":null,"spread":false},{"title":"图例2.PNG <span style='color:#111;'> 96.71KB </span>","children":null,"spread":false},{"title":"readme.txt <span style='color:#111;'> 206B </span>","children":null,"spread":false}],"spread":true}],"spread":true}]