Edit in JSFiddle

<div class="box15">
       <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 class="box15_ribbon"></div>
</div>

body {
    font-size: 11px;
    font-family: 'Open Sans', sans-serif;
    color: #4A4A4A ;
    text-align: center; 
}

.box15{
    margin: 40px auto;
    width: 320px;
    min-height: 310px;
    padding: 10px;
    position:relative;
    background: -webkit-gradient(linear, 100% 100%, 50% 10%, from(#fff), to(#f3f3f3), color-stop(.1,#fff));
    border: 1px solid #ccc;
    -webkit-box-shadow: 1px 1px 4px rgba(0,0,0, 0.1);
    -webkit-border-bottom-right-radius: 60px 5px;
    
}

.box15:before{
    content: '';
    width: 98%;
    z-index:-1;
    height: 100%;
    padding: 0 0 1px 0;
    position: absolute;
    bottom:0; right:0;
    background: -webkit-gradient(linear, 0% 20%, 0% 92%, from(#fff), to(#f9f9f9), color-stop(.1,#fff));
    border: 1px solid #ccc;
    -webkit-box-shadow: 1px 1px 8px rgba(0,0,0, 0.1);
    -webkit-border-bottom-right-radius: 60px 5px;
    -webkit-transform: skew(2deg,2deg)
                        translate(3px,8px)
}
.box15:after{
    content: '';
    width: 98%;
    z-index:-1;
    height: 98%;
    padding: 0 0 1px 0;
    position: absolute;
    bottom:0; right:0;
    background: -webkit-gradient(linear, 0% 20%, 0% 100%, from(#f3f3f3), to(#f6f6f6), color-stop(.1,#fff));
    border: 1px solid #ccc;
    -webkit-box-shadow: 0px 0px 8px rgba(0,0,0, 0.1);
    -webkit-transform: skew(2deg,2deg)
                        translate(-1px,2px)
}

.box15_ribbon{
    position:absolute;
    top:0; left: 0;
    width: 130px;
    height: 40px;
    background: -webkit-gradient(linear, 555% 20%, 0% 92%, from(rgba(0, 0, 0, 0.1)), to(rgba(0, 0, 0, 0.0)), color-stop(.1,rgba(0, 0, 0, 0.2)));
    border-left: 1px dashed rgba(0, 0, 0, 0.1);
    border-right: 1px dashed rgba(0, 0, 0, 0.1);
    -webkit-box-shadow: 0px 0px 12px rgba(0, 0, 0, 0.2);
    -webkit-transform: rotate(-30deg) skew(0,0) translate(-30px,-20px);
}

.box15 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 ;
}