<div class="konusma-balonu">
  İnsan gerçekten hayret ediyor.
</div>

.konusma-balonu{
  background-color:#40DBE5;
  float:left;
  padding:10px 20px;
  border-radius:5px;
  font-size:20px;
  position:relative;
  color: white;
  margin-top: 20px;
  border: 1px solid #6b5fb3;
}

.konusma-balonu:after{
  content: '';
  position:absolute;
  left: 30px;
  top:-15px;
  border-style: solid;
  border-width: 0 15px 15px 15px;;
  border-color: transparent transparent #40DBE5 transparent;  
}

.konusma-balonu:before{
  content: '';
  position:absolute;
  left: 29px;
  top:-16px;
  border-style: solid;
  border-width: 0 16px 16px 16px;;
  border-color: transparent transparent #6b5fb3 transparent;  
}