Use prefered color scheme on webserver error pages

Author: Will Fris

sapi/cli/php_cli_server.c

@@ -240,26 +240,46 @@ ZEND_DECLARE_MODULE_GLOBALS(cli_server)
  * copied from ext/standard/info.c
  */
 static const char php_cli_server_css[] = "<style>" \
+										":root{" \
+										"--c-black:#000000;" \
+										"--c-dark-grey:#333333;" \
+										"--c-lavender-misty:#E2E4EF;" \
+										"--c-blue-bell:#9999CC;" \
+										"--c-white:#FCFCFC;" \
+										"--php-background:light-dark(" \
+										"var(--c-white),var(--c-dark-grey)" \
+										");" \
+										"--php-code-background:var(--c-lavender-misty);" \
+										"--php-code-foreground:var(--c-black);" \
+										"--php-foreground:light-dark(" \
+										"var(--c-dark-grey),var(--c-lavender-misty)" \
+										");" \
+										"--php-heading-background:var(--c-blue-bell);" \
+										"--php-heading-foreground:var(--c-black);" \
+										"color-scheme:light dark;" \
+										"}" \
 										"body{" \
-										"background-color:#fcfcfc;" \
-										"color:#333333;" \
+										"background-color:var(--php-background);" \
+										"color:var(--php-foreground);" \
 										"margin:0;" \
 										"padding:0;" \
 										"}" \
 										"h1{" \
 										"font-size:1.5em;" \
 										"font-weight:normal;" \
-										"background-color:#9999cc;" \
+										"background-color:var(--php-heading-background);" \
+										"color:var(--php-heading-foreground);" \
 										"min-height:2em;" \
 										"line-height:2em;" \
-										"border-bottom:1px inset black;" \
+										"border-bottom:1px inset var(--php-black);" \
 										"margin:0;" \
 										"}" \
 										"h1,p{" \
 										"padding-left:10px;" \
 										"}" \
 										"code.url{" \
-										"background-color:#eeeeee;" \
+										"background-color:var(--php-code-background);" \
+										"color:var(--php-code-foreground);" \
 										"font-family:monospace;" \
 										"padding:0 2px;" \
 										"}" \