I would suggest to provide some screenshots that would explain what you trying to achieve and what is happening right now.
You can also take a look at this article for inspiration:
http://xlinesoft.com/blog/2013/10/26/building-a-nice-looking-login-page-with-custom-css/
i did exactly how explain on custom-css
even login not transparent;
here is code:(( / makes login form semi-transparent /
.function-login .rnr-c >
{
background: rgba(17,17,17,0.85) !important;
}
/ login page background /
body.function-login {
height:100%;
background:transparent url("https://asprunner.com/forums/file.php?topicimage=1&fieldname=reply&id=72679&image=1&table=forumreplies";) no-repeat center center fixed;
background-size:cover;
}
body.function-list {
height:100%;
background:transparent url("https://asprunner.com/forums/file.php?topicimage=1&fieldname=reply&id=72679&image=2&table=forumreplies";) no-repeat center center fixed;
background-size:cover;
}
/ styling of 'remember password' link /
a.forgot {
color: #70d4dd;
text-decoration: none;
font-family: 'Open Sans', sans-serif;
font-size: 12px;
font-style: normal;
font-weight: normal;
font-variant: normal;
}
/ sets height of the login form header /
.rnr-b-loginheader {
height: 100px;
}
/ Facebook button styling /
.facebook {
-webkit-box-shadow: rgb(152, 202, 245) 0px 2px 0px -1px inset, rgba(64, 64, 64, 0.298039) 0px 2px 2px 0px;
background-attachment: scroll;
background-clip: border-box;
background-color: rgb(0, 131, 213);
background-image: -webkit-gradient(linear, 0% 0%, 0% 100%, color-stop(0.05, rgb(80, 164, 216)), to(rgb(0, 131, 213)));
background-origin: padding-box;
background-size: auto;
border-bottom-color: rgb(8, 135, 213);
border-bottom-left-radius: 3px;
border-bottom-right-radius: 3px;
border-bottom-style: solid;
border-bottom-width: 1px;
border-image-outset: 0px;
border-image-repeat: stretch;
border-image-slice: 100%;
border-image-source: none;
border-image-width: 1;
border-left-color: rgb(8, 135, 213);
border-left-style: solid;
border-left-width: 1px;
border-right-color: rgb(8, 135, 213);
border-right-style: solid;
border-right-width: 1px;
border-top-color: rgb(8, 135, 213);
border-top-left-radius: 3px;
border-top-right-radius: 3px;
border-top-style: solid;
border-top-width: 1px;
box-shadow: rgb(152, 202, 245) 0px 2px 0px -1px inset, rgba(64, 64, 64, 0.298039) 0px 2px 2px 0px;
color: rgb(255, 255, 255);
cursor: auto;
display: block;
font-family: 'Open Sans', sans-serif;
font-size: 16px;
font-style: normal;
font-variant: normal;
font-weight: bold;
height: 49px;
line-height: 49px;
list-style-image: none;
list-style-position: outside;
list-style-type: none;
margin-bottom: 0px;
margin-left: auto;
margin-right: auto;
margin-top: 30px;
outline-color: rgb(255, 255, 255);
outline-style: none;
outline-width: 0px;
padding-bottom: 0px;
padding-left: 32px;
padding-right: 2px;
padding-top: 0px;
text-align: left;
text-decoration: none;
text-shadow: rgb(0, 0, 0) 0px -1px 1px;
text-transform: uppercase;
vertical-align: baseline;
width: 252px;
background: -moz-linear-gradient(center top , #50A4D8 5%, #0083D5 100%) repeat scroll 0 0 transparent;
}
a.facebook-icon:before {
background: url(https://asprunner.com/forums/file.php?topicimage=1&fieldname=reply&id=72679&image=3&table=forumreplies) no-repeat;
content: '';
display: inline-block;
width: 29px;
height: 29px;
position: relative;
left: -15px;
top: 9px;
}
/ make input boxes on the login page slightly large /
.function-login input[type=text], .function-login input[type=password] {
background-color: #ffffff;
border: 1px solid #c3c2c2;
-webkit-box-shadow: inset 0 1px 1px rgba(0,0,0,0.075);
-moz-box-shadow: inset 0 1px 1px rgba(0,0,0,0.075);
box-shadow: inset 0 1px 1px rgba(0,0,0,0.075);
width: 290px !important;
display: inline-block;
height: 26px;
padding: 0px 6px;
margin: 5px 0 0 0;
font-size: 12px;
line-height: 14px;
color: #555555;
-webkit-border-radius: 4px;
-moz-border-radius: 4px;
border-radius: 4px;
}
.function-login .rnr-page {
margin: 50px auto 0 auto;
padding: 0 0 20px 0;
display: block;
}
/ width of the login form */
.function-login .rnr-c-fields {
width: 350px;
}
)))))))
images:
login not transparent:
image transparent:
