How to use text-transform to transform text?

Set text-transform:

text-transform applies a transformation to a block of text. Its allowed values are:

none
capitalize
uppercase
lowercase

It can be used to turn everything into uppercase or lowercase letters, or capitalize the first letter of each word.
p {text-transform:uppercase;}
p {text-transform:lowercase;}
p {text-transform:capitalize;}

        HyperText Markup Language (HTML)