Do not fill child backgrounds in dark mode (#1768)

Small change which allows users to style the body background with dark mode enabled, without having to style the child elements (a, h1) as well.

Author: dmadison

wm_strings_en.h

@@ -112,7 +112,8 @@ const char HTTP_STYLE[]            PROGMEM = "<style>"
 "button.D{background-color:#dc3630}"
 "button:active{opacity:50% !important;cursor:wait;transition-delay: 0s}"
 // invert
-"body.invert,body.invert a,body.invert h1 {background-color:#060606;color:#fff;}"
+"body.invert{background-color:#060606;}"
+"body.invert,body.invert a,body.invert h1 {color:#fff;}"
 "body.invert .msg{color:#fff;background-color:#282828;border-top:1px solid #555;border-right:1px solid #555;border-bottom:1px solid #555;}"
 "body.invert .q[role=img]{-webkit-filter:invert(1);filter:invert(1);}"
 ":disabled {opacity: 0.5;}"