library_books<style>
* { box-sizing: border-box; }
.chat {
  position:relative;
  background-color:#fcddb8;
  width:160px;
  border-radius:10px 0 10px 10px;
  padding:8px 16px;
  margin:5px;
}
.chat::after {
  content:'';
  position:absolute;
  right:-20px;
  top:0;
  border:10px solid transparent;
  border-left-color:#fcddb8;
  border-top-color:#fcddb8;
}
</style>
<div class="chat">Hello this is a chat box..!</div>