font-size

The font-size property sets text size. Font size values can be in many different units like absolute lengths and relative lengths.

font-size: <font-size-value>;

Absolute lengths can be the following:

• px
• in
• mm
• cm
• pt
• pc

Relative lengths can be the following:

• %
• em
• rem
• ch
• ex
• vh
• vw
• vmax
• vmin

Set the p tag to 16px:

p {
  font-size: 16px;
}

Set the p tag to 2em:

html {
  font-size: 16px;
}

p {
  font-size: 2em;
}