為什麼我設定的背景沒有被顯示
<!DOCTYPE html>
<html lang="en">
<head>
< ;meta charset="UTF-8">
<title>主題</title>
<style type="text/css">
body{background-image: gt;
body{background( "http://image.baidu.com/search/detail?ct=503316480&z=undefined&tn=baiduimagedetail&ipn=d&word=網站背景圖片&step_word=&ie=utf-8&in=&cl=2&lm=-1&st=undefined&ie=utf-8&in=&cl=2&lm=-1&st=undefined&ie=utf-8&in=&cl=2&lm=-1&st=undefined&ie=utf-8&in=&cl=2&lm=-1&st=undefined&cs70268380262020802020208,0202020202. ,1871909306&simid=3439302190,300194912&pn=5&rn=1&di=19776411160&ln=1590&fr=&fmq=1534075403413_R&fm=&ic=undefined&s=undefined&se=&sme=&tab=0&width=undefined&height=undefined&face=undefined&is=0,0&istype=0&ist=&jit=&bdtype=0&spn=0&pi =0&gsm=0&hs=2&objurl=http://pic3.16pic.com/00/03/77/16pic_377171_b.jpg&rpstart=0&rpnum=0&adpicid=0&ctd=1534075408417^3_1182=0&ctd=1534075408417^3_11821875020000 =0&lpn=0&cs =726661828,2758549640&pi=0&simid=3439302190,300194912&objurl=http://pic3.16pic.com/00/03/77/16pic_377171_b.jpgfm8m
hr{color: aqua}
</style>
</head>
<body>
<br/>##<
div ><big>登入頁面</big></div>
<hr/>
帳號:<input type="email"><br><br>input type="email"><br><br> />
密碼:<input type="password"><br><br/>
<button type="button">註冊</button>
</body>