<div class='ribbon'>  
  <a href='#'><span>Главная</span></a>  
  <a href='#'><span>О нас</span></a>  
  <a href='#'><span>Сервисы</span></a>  
  <a href='#'><span>Контакты</span></a>  
  </div>

.ribbon {  
display:inline-block;  
}  

.ribbon:after, .ribbon:before {  
margin-top:0.5em;  
content: "";  
float:left;  
border:1.5em solid #fff;  
}  

.ribbon:after {  
border-right-color:transparent;  
}  

.ribbon:before {  
border-left-color:transparent;  
}  

.ribbon a:link, .ribbon a:visited {
color:#000;  
text-decoration:none;  
float:left;  
height:3.5em;  
overflow:hidden;  
}  

.ribbon span {  
background:#fff;  
display:inline-block;  
line-height:3em;  
padding:0 1em;  
margin-top:0.5em;  
position:relative;  

-webkit-transition: background-color 0.2s, margin-top 0.2s; /* Saf3.2+, Chrome */  
-moz-transition: background-color 0.2s, margin-top 0.2s; /* FF4+ */  
-ms-transition: background-color 0.2s, margin-top 0.2s; /* IE10 */  
-o-transition: background-color 0.2s, margin-top 0.2s; /* Opera 10.5+ */  
transition: background-color 0.2s, margin-top 0.2s;  
}  

.ribbon a:hover span {  
background:#FFD204;  
margin-top:0;  
}  

.ribbon span:before {  
content: "";  
position:absolute;  
top:3em;  
left:0;  
border-right:0.5em solid #9B8651;  
border-bottom:0.5em solid #fff;  
}  

.ribbon span:after {  
content: "";  
position:absolute;  
top:3em;  
right:0;  
border-left:0.5em solid #9B8651;  
border-bottom:0.5em solid #fff;  
}