diff --git a/routes/css.cpp b/routes/css.cpp
index 6695bd2..57d1ec9 100644
--- a/routes/css.cpp
+++ b/routes/css.cpp
@@ -4,7 +4,7 @@
 #include "routes.h"
 #include "../servehelper.h"
 
-#define CSS R"EOF(
+static const constexpr char css[] = R"EOF(
     /* GENERAL */
     :root {
         --background-color: black;
@@ -131,10 +131,10 @@
         border-style: solid;
         border-color: var(--error-border-color);
     }
-)EOF"
-#define CSS_LEN sizeof(CSS) / sizeof(CSS[0]) - 1
+)EOF";
+#define CSS_LEN sizeof(css) / sizeof(css[0]) - 1
 
-const uint64_t css_hash = FastHashConstEval(CSS, CSS_LEN, 0);
+const uint64_t css_hash = FastHashConstEval(css, CSS_LEN, 0);
 
 void css_route(const httplib::Request& req, httplib::Response& res) {
     res.set_header("ETag", std::string(1, '"') + std::to_string(css_hash) + '"');
@@ -145,6 +145,6 @@ void css_route(const httplib::Request& req, httplib::Response& res) {
         res.set_header("Content-Length", std::to_string(CSS_LEN));
         res.set_header("Content-Type", "text/css");
     } else {
-        res.set_content(CSS, CSS_LEN, "text/css");
+        res.set_content(css, CSS_LEN, "text/css");
     }
 }