.kdnlogin-box { position: fixed; left: 50%; top: 50%; width: 900px; height: 600px; border: 1px solid #ccc; margin-left: -350px; margin-top: -300px; background-color: #fff; } .kdnlogin-title { height: 40px; line-height: 40px; background-color: #e5e5e5; padding-left: 15px; } .kdnlogin-close { color: #333; float: right; vertical-align: middle; margin-top: -1px; margin-right: 15px; cursor: pointer; } .kdnlogin-close:hover { color: #555; }