how to do font size in css code example

Example 1: font size css

.class {
	font-size: 12px;
}

Example 2: change the weight of a bold font css

p {  
  font-weight: normal;
} 
a {  
  font-weight: bold;
}  
p.thick {  
  font-weight: 780;
}

Example 3: font size css

/* <absolute-size> values */
font-size: xx-small;
font-size: x-small;
font-size: small;
font-size: medium;
font-size: large;
font-size: x-large;
font-size: xx-large;
font-size: xxx-large;

/* <relative-size> values */
font-size: smaller;
font-size: larger;

/* <length> values */
font-size: 12px;
font-size: 0.8em;

/* <percentage> values */
font-size: 80%;

/* Global values */
font-size: inherit;
font-size: initial;
font-size: unset;