<div class="note">  
   <p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Mauris pulvinar rhoncus risus, vel ornare lacus sagittis sit amet. Duis vel sem magna. Proin pulvinar velit eleifend ligula ultrices vestibulum. Nunc posuere dolor eu mauris feugiat dignissim.</p>  
   <p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Mauris pulvinar rhoncus risus, vel ornare lacus sagittis sit amet. Duis vel sem magna. Proin pulvinar velit eleifend ligula ultrices vestibulum. Nunc posuere dolor eu mauris feugiat dignissim.</p>  
</div>  

<style>  
.note {  
   position:relative;  
   width:30%;  
   padding:1em 1.5em;  
   margin:2em auto;  
   color:#fff;  
   background:#97C02F;  
}  

.note:before {  
   content:"";  
   position:absolute;  
   top:0;  
   right:0;  
   border-width:0 16px 16px 0;  
   border-style:solid;  
   border-color:#fff #fff #658E15 #658E15;  
   background:#658E15;  
   -webkit-box-shadow:0 1px 1px rgba(0,0,0,0.3), -1px 1px 1px rgba(0,0,0,0.2);  
   -moz-box-shadow:0 1px 1px rgba(0,0,0,0.3), -1px 1px 1px rgba(0,0,0,0.2);  
   box-shadow:0 1px 1px rgba(0,0,0,0.3), -1px 1px 1px rgba(0,0,0,0.2);  
   display:block; width:0; /* Преодоление ограничений Firefox 3.0 */  
}  

.note.rounded {  
   -webkit-border-radius:5px;  
   -moz-border-radius:5px;  
   border-radius:5px;  
}  

.note.rounded:before {  
   border-width:8px;  
   border-color:#fff #fff transparent transparent;  
   -webkit-border-bottom-left-radius:5px;  
   -moz-border-radius:0 0 0 5px;  
   border-radius:0 0 0 5px;  
}  
</style>