body {
    margin: 0;
    padding: 0;
}

form_login {
	left: 50%;
    top: 50%;
    margin-left: -25%;
    position: absolute;
    margin-top: -25%;
}

.span {
    left: 50%;
    top: 50%;
    margin-left: -25%;
    position: absolute;
    margin-top: -25%;
}