css常見問題整理

1，當導航欄顯示留白的問題解決方式

html,body, div, dl, dt, dd, ul, ol, li, h1, h2, h3, h4, h5, h6, pre, code, form, fieldset, legend, input, button, textarea, p, blockquote, th, td{

margin: 0;
padding:0;
}