The text-transform CSS property specifies how to capitalize an element's text. It can be used to make text appear in all-uppercase or all-lowercase, or with each word capitalized. It also can help improve legibility for ruby.
/* Keyword values */
text-transform: none;
text-transform: capitalize;
text-transform: uppercase;
text-transform: lowercase;
text-transform: full-width;
text-transform: full-size-kana;
/* Global values */
text-transform: inherit;
text-transform: initial;
text-transform: unset;Source: https://developer.mozilla.org/en-US/docs/Web/CSS/text-transform