Problem adding image bullet on sidebar

i’m trying to put little imgs as bullets in my sidebar, i used this code down here but it’s not showing, do u know why?

div.sidebar ul li h3{
	font-size:1.1em;
	font-weight:800;
	letter-spacing:-0.1px;
	margin:0;
	border-bottom-width: 2px;
	border-bottom-style: solid;
	border-bottom-color: #000000;
	background-attachment: fixed;
	background-image: url(images/blt_star1.jpg);
	background-repeat: no-repeat;
	background-position: left center;
        padding-left: 24px;
}

I know only basic css. am designing on the base of the “veryplaintxt” theme. help anyone ? 🙂