when branding your site and making changes to your css how

when branding your site and making changes to your css how do you save changes to several css changes, for example I have this code

body.login {

background: url(“”:wink: repeat scroll left top #ff0800;

height: auto;

and I want to include this login button

#login .button {

width: 260px;

height: 44px;

-moz-border-radius: 4px;

-webkit-border-radius: 4px;

border-radius: 4px;

float: center;

border: 1px solid #3d5a5a;

what code would I use to have both changes or do have to make them seperate thank you