Why the background I set is not displayed
<!DOCTYPE html>
<html lang="en">
<head>
< ;meta charset="UTF-8">
<title>theme</title>
<style type="text/css">
body{background-image: url( "http://image.baidu.com/search/detail?ct=503316480&z=undefined&tn=baiduimagedetail&ipn=d&word=Website background image&step_word=&ie=utf-8&in=&cl=2&lm=-1&st=undefined&cs=726661828,2758549640&os=2228873300 ,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_1182X859%1#pn=5&spn=0&di=1977641116 0&adpicid=0&lpn=0&cs =726661828,2758549640&pi=0&simid=3439302190,300194912&objurl=http://pic3.16pic.com/00/03/77/16pic_377171_b.jpg&fromurl=ippr_z2C$qAzdH3FAzdH3Fooo_z&e3B8mrtv _z&e3Bv54AzdH3Fri5p5AzdH3Frtv_n00808_z&e3Bip4s&W=650&H=365&S=&TP=jpg")}
div{ color: red}
hr{color: aqua}
</style>
</head>
<body>
<br/>
< div ><big>Login page</big></div>
<hr/>
Account:<input type="email"><br><br />
Password:<input type="password"><br><br/>
<button type="button">Register</button>
</body>
</html>
![[Web front-end] Node.js quick start](https://img.php.cn/upload/course/000/000/067/662b5d34ba7c0227.png)
url points to the specific image address