css how to make text italic

1/* I know i already made a HOW TO MAKE CSS TEXT ITALIC but here's one 
2100% css */
3#italic-selector {font-style:italic;}

1.example {
2  font-style: italic;
3}

1<style>
2#italic{
3  font-style: italic;
4  } </style> <p id="italic">This is my italic text. :)</p>