.Login_background {
-webkit-background-size: 100% 100%;           /* Safari 3.0 */
-moz-background-size: 100% 100%;           /* Gecko 1.9.2 (Firefox 3.6) */
-o-background-size: 100% 100%;           /* Opera 9.5 */
background-size: 100% 100%;           /* Gecko 2.0 (Firefox 4.0) and other CSS3-compliant browsers */
}