How to round corners of login box?

@poonam9, Do you have some CSS suggestions yet for how to round the corners of the login box? I’ve tried the following but it isn’t working:

/*--------------------------------------------------------------
7.1 Login form
--------------------------------------------------------------*/

.login #login form#loginform {
	border: 5px double #999 !important;
	border-radius: 16px !important;
}

#login ul.square {
	color: #fefdff !important;  /*----Splashed white ----*/
	background-color: transparent;
	margin: 0 0 0 22px;
	padding: 0 0 0 22px;
	}

#login ul.square li {
	color: #fefdff !important;  /*----Splashed white ----*/
	background-color: transparent;
	list-style: square outside !important;
	margin: 0 0 0 10px;
/*	padding: 1em 0 0.3em -1em !important; */
	padding: 3px 5px !important;
	}

#login p#backtoblog a:link {
	color: #2662ef;    /*  Bright blue  */
	background-color: transparent;
	font-size: 90%;
	font-weight: 400;
}

#login p#backtoblog a:hover, #login p#backtoblog a:focus {
	color:#ddff22;    /*  vivid yellow  */
	background-color: transparent;
	font-size: 90%;
	font-weight: 400;
}

#loginform {
	border-radius:16px;
}

#login .loginform {
	border-radius:16px;
}