chore: Adjust secondary text style (#545)

src/pages/_theme.tsx

@@ -6,7 +6,7 @@ export const defaultTheme = {
   primary_color: "#007AFF",
   secondary_color: "#FFCC00",
   primary_text: "#000000",
-  secondary_text: "rgba(60, 60, 67, 0.60)",
+  secondary_text: "#993c3c43",
   info_color: "#007AFF",
   error_color: "#FF3B30",
   warning_color: "#FF9500",
@@ -24,7 +24,7 @@ export const defaultDarkTheme = {
   secondary_color: "#FF9F0A",
   primary_text: "#ffffff",
   background_color: "#2e303d",
-  secondary_text: "rgba(235, 235, 245, 0.60)",
+  secondary_text: "#99ebebf5",
   info_color: "#0A84FF",
   error_color: "#FF453A",
   warning_color: "#FF9F0A",