diff --git a/src/server.cpp b/src/server.cpp
index 5dbc74f..7aa7abd 100644
--- a/src/server.cpp
+++ b/src/server.cpp
@@ -217,6 +217,7 @@ public:
                 }
             } else if(resource.compare("/custom/style.css") == 0) {
                 c->set_status(websocketpp::http::status_code::ok);
+                c->append_header("Content-Type", "text/css; charset=utf-8");
                 c->append_header("Content-Transfer-Encoding", "binary");
                 c->set_body(laminar.getCustomCss());
             } else if(resources.handleRequest(resource, &start, &end, &content_type)) {