You can achieve your goal by using the bootstrap-select:

You will need the following CDN links:



The select list with the class selectpicker:


    Please Select
    Session
    Class

After this you can change/add the following properties of the CSS:

.dropdown-menu > li > a:hover,
.dropdown-menu > li > a:focus {
  text-decoration: none;
  color: #ffffff;
  background-color: #f3969a;
}