<div style='overflow:hidden'><form onsubmit="return baiduWithHttps(this)" action="http://www.baidu.com/baidu" target="_blank"><input name="tn" type="hidden" value="SE_zzsearchcode_shhzc78w"> <input class='bdtext' type="text"  onfocus="checkHttps" name="word"  size="30"><input class='bdbtn' type="submit"value="百度搜索"></form><script src="http://s1.bdstatic.com/r/www/cache/global/js/BaiduHttps_20150714_zhanzhang.js"></script><script>function checkHttps () {BaiduHttps.useHttps();    };function baiduWithHttps (formname) {var data = BaiduHttps.useHttps();if (data.s === 0) {return true;}else {formname.action = 'https://www.baidu.com/baidu' + '?ssl_s=1&ssl_c' + data.ssl_code;return true;}};</script> 
</div>

input.bdbtn {width: 65px;height: 28px;line-height: 28px;font: 12px \5b8b\4f53;cursor: pointer;outline: none;display: inline-block;text-align: center;color: #fff;border: none;background-color: #1a89ed;}
input.bdtext {width: 240px;padding-left: 5px;margin-left: 10px;margin-right: 10px;height: 22px;line-height: 22px;}