Edit in JSFiddle

<div class="wrap">
       <h1>Sample Box</h1>   
       <img src="http://www.wpthemegenerator.com/wp-content/uploads/2012/06/Image.jpg">
        <p>
         Lorem ipsum dolor sit amet, consectetur adipiscing elit. Nam luctus consectetur dolor a porttitor. Curabitur id sem sed ante fringilla pulvinar et id lectus. Nullam justo ipsum, hendrerit ut commodo nec, pellentesque nec erat. Pellentesque pharetra.
       </p> 
       <br />
       <a href="http://www.designshock.com/"> DesignShock.com </a>
</div>
<div class="gradient"></div>

* {
    margin: 0;
    padding: 0;
}

body {
    background: url('http://www.demo.amitjakhu.com/login-form/images/bg.png');
    font-size: 11px;
    font-family: 'Open Sans', sans-serif;
    color: #4A4A4A ;
    text-align: center; 
}

.wrap {  
    margin: 20px auto;
    display: block;
    width: 300px;
    height: 310px;
    padding:20px;
    
    background: #f3f3f3;
    border: 1px solid #fff;
    border-radius: 5px;
    
    box-shadow: 0 1px 3px rgba(0,0,0,0.5);
    -moz-box-shadow: 0 1px 3px rgba(0,0,0,0.5);
    -webkit-box-shadow: 0 1px 3px rgba(0,0,0,0.5);
}



.gradient {
    /* Center Positioning */
    width: 600px;
    height: 600px;
    position: fixed;
    left: 50%;
    top: 50%;
    margin-left: -300px;
    margin-top: -300px;
    z-index: -2;
    
    /* Fallback */ 
    background-image: url(http://www.demo.amitjakhu.com/login-form/images/gradient.png); 
    background-repeat: no-repeat; 
    
    /* CSS3 Gradient */
    background-image: -webkit-gradient(radial, 0% 0%, 0% 100%, from(rgba(213,246,255,1)), to(rgba(213,246,255,0)));
    background-image: -webkit-radial-gradient(50% 50%, 40% 40%, rgba(213,246,255,1), rgba(213,246,255,0));
    background-image: -moz-radial-gradient(50% 50%, 50% 50%, rgba(213,246,255,1), rgba(213,246,255,0));
    background-image: -ms-radial-gradient(50% 50%, 50% 50%, rgba(213,246,255,1), rgba(213,246,255,0));
    background-image: -o-radial-gradient(50% 50%, 50% 50%, rgba(213,246,255,1), rgba(213,246,255,0));
}

.wrap img {
    width: 100%;
    margin-top: 15px;
}

p{ 
    margin-top: 15px;
    text-align: justify;
}

h1{
    font-size: 20px;
    font-weight: bold;
    margin-top: 5px; 
    text-shadow: 1px 1px 3px rgba(0,0,0,0.3);
}

a{
    text-decoration: none;
    color: #4A4A4A !important;
}

a:hover{
    text-decoration: underline;
    color: #6B6B6B !important ;
}