diff --git a/app/styles/_class.scss b/app/styles/_class.scss
index fd7b89bb..76c99e5f 100644
--- a/app/styles/_class.scss
+++ b/app/styles/_class.scss
@@ -10,7 +10,7 @@ article.chapter {
     display: block;
     position: relative;
 
-    @media (min-width: $mobile-portrait-screen + 1){
+    @media (min-width: ($mobile-portrait-screen + 1)){
       &::before, &::after {
         transition: 0.2s opacity, 0.2s transform;
       }
diff --git a/package.json b/package.json
index 6d5aee31..b173fca9 100644
--- a/package.json
+++ b/package.json
@@ -117,7 +117,7 @@
     "testem": "^2.14.0"
   },
   "engines": {
-    "node": "14.* || 16.* || 18.*",
+    "node": "14.*",
     "npm": "8"
   },
   "cacheDirectories": [