Login form background help

I inserted an image and no matter what size or code i use it just wont fix
I am not such a pro in this hope you can help me
This was my last code attempt
#login {
width:330px;
height:1000%;
background-size: 325px 1000px;
margin:0 auto;
display:block; }

this is the site:

this was the outcome using the code:

https://ww.wp.xz.cn/plugins/custom-login/