Sadece Div içindeki Background saydam yapmak İstiyorum

	<div class="col-md-3" style="background-color: #f5f5f5; margin-top:  220px;width:242px; height: 250px; left: 450px; opacity:0.6; filter:alpha(opacity=60); ">
		<div class="col-md-12" style="right: 10px ;top: 10px; opacity:10; filter:alpha(opacity=100);">

			<b style="font-size: 20px">Kullanıcı Adı</b>
			<input class="input" type="" name=""> 

		</div>

		<div class="col-md-12" style="top: 50px; right: 10px">

			<b style="font-size: 20px">Şifre</b>

			<input class="input" type="" name="">
		</div>
	</div>