Check out example codes for "font-style". It will help you in understanding the concepts better.

Code Example 1

p.a {
  font-style: normal;
}


p.b {
  font-style: italic;
}


p.c {
  font-style: oblique;
}

Code Example 2

h1 {
  font-style: italic;
}

Code Example 3

h1 {
	font-family: "Times New Roman", Times, serif;
}

Code Example 4

.my_italic_class{
  font-style: italic;
}

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