css add pseudo element code example

Example 1: after element is blocking

.select:after {
    position:absolute;
    bottom:.15em;
    top:.15em;
    right:.5rem;
    content:'\2193';
    pointer-events: none;
}

Example 2: pseudo elements css

psuedo element(An intuitive answer):
							keywords added to selectors (which are followed by 
                            colon ':' or double colon '::') which allow to target
                            specific element (or specific part of element).
example:
 you can style the first letter of a paragraph as->  p:first-letter{/*styles*/}

STRONG NOTE:  Keep in mind that  ::first-line pseudo-element  must be applied
			  to block level (elements which break line on use)
			  elements in order to take effect.