<!-- See https://dev.to/ayc0/css-specificity-23ga  -->
<div id="id" class="red" style="color: RebeccaPurple">Hello world</div>

#id {
  color: SeaGreen;
}
.red {
  color: OrangeRed;
}
div {
  color: RoyalBlue;
}

/* Auto dark mode */
:root {
  color-scheme: light dark;
}