diff --git a/.eslintrc.json b/.eslintrc.json
index bfb117c..86c568e 100644
--- a/.eslintrc.json
+++ b/.eslintrc.json
@@ -3,5 +3,8 @@
     "env": {
         "node": true,
         "jest": true
+    },
+    "rules": {
+        "linebreak-style": 0
     }
 }
\ No newline at end of file
diff --git a/src/components/DivElement.js b/src/components/DivElement.js
index e66604c..6c83c45 100644
--- a/src/components/DivElement.js
+++ b/src/components/DivElement.js
@@ -1,6 +1,15 @@
 const HTMLElement = require('./HTMLElement');
 
 // Define class here
+class DivElement extends HTMLElement {
+  constructor(content) {
+    super('div', content);
+  }
+}
+
+// let foo = new DivElement('hello');
+// let divString = foo.render();
+// console.log(divString);
 
 // Export class here
-module.exports = {};
+module.exports = DivElement;
diff --git a/src/components/HTMLElement.js b/src/components/HTMLElement.js
index cae2e29..a1a2757 100644
--- a/src/components/HTMLElement.js
+++ b/src/components/HTMLElement.js
@@ -1,4 +1,17 @@
 // Define class here
+class HTMLElement {
+  constructor(tag, content) {
+    this.tag = tag;
+    this.content = content;
+  }
+  render() {
+    return `<${this.tag}>${this.content}</${this.tag}>`;
+  }
+}
+
+// let foo = new HTMLElement('p', 'hello');
+// let htmlString = foo.render();
+// console.log(htmlString);
 
 // Export class here
-module.exports = {};
+module.exports = HTMLElement;
diff --git a/src/timer/Timer.js b/src/timer/Timer.js
index 03851f2..1255a70 100644
--- a/src/timer/Timer.js
+++ b/src/timer/Timer.js
@@ -1,17 +1,17 @@
-function Timer(seconds) {
-  this.seconds = seconds;
-}
-
-Timer.prototype.start = function() {
-  var instance = this;
-  var timerInterval = setInterval(function() {
-    if (instance.seconds === 0) {
-      clearInterval(timerInterval);
-    }
+class Timer {
+  constructor(seconds) {
+    this.seconds = seconds;
+  }
 
-    console.log(instance.seconds);
-    instance.seconds -= 1;
-  }, 1000);
-};
+  start() {
+    const timerInterval = setInterval(() => {
+      if (this.seconds === 0) {
+        clearInterval(timerInterval);
+      }
+      console.log(this.seconds);
+      this.seconds -= 1;
+    }, 1000);
+  }
+}
 
 module.exports = Timer;