nav div a href.首页/a a hrefindex.php?id9导航/a a hrefindex.php?id9关于/a a hrefedit.php/a /div div idnav_right form actionindex.php idform_search input typetext namewd idwd placeholder搜索 /form /div /navnav { display:flex; justify-content:space-between; } #nav_right { display:flex; align-items: center; } #form_search { margin-block-end:0; }搞了半天是因为 form 有一个用户代理样式 margin-block-end:1em;