:root {
  font-size: 15px !important;
  --ls-page-title-size: 15px;
  --ct-text-size: 13px;
  --ct-line-height: 1.3;
 ;;   --ls-font-family: "JetBrains Mono";
 ;;   --ct-page-title-font-family: var(--ls-font-family);
 ;;   --ct-code-font-family: "JetBrains Mono";
}


 ;; I added these following for examples in case the above does not work
 ;;  :root {
 ;;   --ct-text-size: 18px;
 ;;   --ct-line-height: 1.6;
 ;;   --ls-font-family: "JetBrains Mono";
 ;;   --ct-page-title-font-family: var(--ls-font-family);
 ;;   --ct-code-font-family: "JetBrains Mono";
 ;; }

 ;; :root {
 ;;   font-size: 18px !important;
 ;; }
 ;; 
 ;; a.tag[data-ref] {
 ;;   font-size: 18px !important;
 ;; }