<ul class="ribbon">
  <li class="active">home</li>
  <li>about</li>
  <li>faq</li>
  <li>login</li> 
</ul>  

body {
  background: slategray;
  font-family: arial;
}

ul {
  margin: 50px;
  padding: auto;
  width: 765px; /* remove if you want it to wrap */
}

ul li {
  list-style-type: none;
  display: inline-block;
  margin-right: 26px;
}

.ribbon li {
  height: 50px;
  line-height: 50px;
  width: 150px;
  background: orange;
  font-size: 18px;
  text-align: center;
  position: relative;
  cursor: pointer;
}

.ribbon li::before {
  content: '';
  border-left: 25px solid transparent;
  border-top: 25px solid orange;
  border-bottom: 25px solid orange;
  border-right: 0;
  position: absolute;
  left: -25px;
}

.ribbon li::after {
  content: '';
  border-left: 25px solid orange;
  border-top: 25px solid transparent;
  border-bottom: 25px solid transparent;
  border-right: 0;
  position: absolute;
  right: -25px;
}

.ribbon li:hover, li.active {
  background: tomato;
}

li.active::before,
.ribbon li:hover::before {
  border-left: 25px solid transparent;
  border-top: 25px solid tomato;
  border-bottom: 25px solid tomato;
}

li.active::after,
.ribbon li:hover::after {
  border-left: 25px solid tomato;
  border-top: 25px solid transparent;
  border-bottom: 25px solid transparent;
}

/* 
Another quick lunch break exercize
*/

$(".ribbon li").click(function(){
 $(".ribbon li").not($(this).toggleClass("active")).removeClass("active");
});