fix: fix possible color/typography css issues for dark mode website

Author: dulnan

css/index.css

@@ -68,12 +68,9 @@ html {
 }
 
 .bk {
-  @apply font-sans;
-
+  @apply font-sans text-base text-mono-950 tracking-normal;
   border-color: theme('colors.mono.200');
 
-  letter-spacing: 0;
-
   &.bk-loading-overlay {
     @apply bg-mono-100/90 absolute top-0 left-0 w-full h-full z-init-overlay  flex items-center justify-center;
     &.bk-is-screen {