مطور Mtwer

<div id="container"></div>

#container{.....أوامرك....}
او
div#container{.....أوامرك....}

<div id="container">

<h1>Online File Storage</h1>
 </div>

#container h1{.....أوامرك....}
او
div#container h1{.....أوامرك....}

<h1 class="center">Center-aligned heading</h1>

.center{.......أوامرك......}

div#container
{
	width: 600px;
	margin: 0px auto;
	border: 1px solid #e6eef6;
	background-color: #ffffff;
}

<b><i>This text is bold and italic</b></i>

<b><i>This text is bold and italic</i></b>