See this element:
<font size="4" face="arial" color="Blue">You can see this sentence in Arial Font with size 5 and in blue text color.</font>
It will be:
You can see this sentence in Arial Font with size 5 and in blue text color.
Yes, it is a <font> tag with unique attributes, but sadly this tag will no longer available in HTML5 because this tag has been removed by World Wide Web Consortium (W3C), and it is only working in HTML4 or below.
From the tag above, you can change the size by any number, the font type with any font that is working in internet, is installed on the PC and could be readed by Internet Browser (that's why it's strongly recommended to use standard font type like Times New Roman, Arial, Verdana, or etc.). You can also change the color from value "Blue" to "Red", "Yellow", and other unique color names. If you understand about HTML color code (example: #000000 for black and #ffffff for white, it consist from #RRGGBB which R means Red, G for Green, and B from Blue), you can also add the code, such as color="#42a442".
Good luck! :)