diff --git a/extra/simple-dns-server.js b/extra/simple-dns-server.js
index 4be3f68e..5e5745f0 100644
--- a/extra/simple-dns-server.js
+++ b/extra/simple-dns-server.js
@@ -92,9 +92,18 @@ server.on("request", (request, send, rinfo) => {
                     ttl: 300,
                     data: "#v=spf1 include:_spf.existing.com ~all",
                 });
+            } else if (question.type === Packet.TYPE.CAA) {
+                response.answers.push({
+                    name: question.name,
+                    type: question.type,
+                    class: question.class,
+                    ttl: 300,
+                    flags: 0,
+                    tag: "issue",
+                    value: "ca.existing.com",
+                });
             }
 
-            // TODO: CAA type
         }
 
         if (question.name === "4.3.2.1.in-addr.arpa") {
diff --git a/package.json b/package.json
index b4075b47..24e67373 100644
--- a/package.json
+++ b/package.json
@@ -33,8 +33,7 @@
         "test-install-script-ubuntu": "npm run compile-install-script && docker build --progress plain -f test/test_install_script/ubuntu.dockerfile .",
         "test-install-script-ubuntu1604": "npm run compile-install-script && docker build --progress plain -f test/test_install_script/ubuntu1604.dockerfile .",
         "test-install-script-debian": "npm run compile-install-script && docker build --progress plain -f test/test_install_script/debian.dockerfile .",
-        "simple-dns-server": "node extra/simple-dns-server.js",
-        "codesandbox": "npm run build && npm run start-server"
+        "simple-dns-server": "node extra/simple-dns-server.js"
     },
     "dependencies": {
         "@fortawesome/fontawesome-svg-core": "^1.2.36",
diff --git a/sandbox.config.json b/sandbox.config.json
deleted file mode 100644
index d51303a5..00000000
--- a/sandbox.config.json
+++ /dev/null
@@ -1,10 +0,0 @@
-{
-    "infiniteLoopProtection": true,
-    "hardReloadOnChange": false,
-    "view": "browser",
-    "container": {
-        "node": "14",
-        "port": 3001,
-        "startScript": "codesandbox"
-    }
-}