diff --git a/index.html b/index.html
index 3a384d5..7aba0ae 100644
--- a/index.html
+++ b/index.html
@@ -15,6 +15,17 @@
       </div>
     </div>
 
+  <nav class="nav">
+      <button popovertarget="theme-popover" class="nav-btn-style" id="night-mode-btn" type="button">Theme</button>
+      <div class="popover-wrapper" id="theme-popover" popover>
+          <div class="theme">
+              <button class="popover-btn-style" type="button" id="light">Light</button>
+              <button class="popover-btn-style" type="button" id="dark">Dark</button>
+              <button class="popover-btn-style" type="button" id="poop">Poop</button>
+          </div>
+      </div>
+  </nav>
+
     <div id="contrib">
       Contribute more haha events on <a href="https://github.com/tsoding/button" target="_blank">GitHub</a>
     </div>
diff --git a/index.js b/index.js
index becf118..8cb5fe2 100644
--- a/index.js
+++ b/index.js
@@ -1,5 +1,13 @@
+const clickMe = document.getElementById("clickMe")
+const root = document.documentElement;
+const theme = document.querySelector('.theme')
 const farts = [];
 
+function handleTheme() {
+    const currentTheme = localStorage.getItem('theme') ?? '';
+    root.className = currentTheme;
+}
+
 function newFart(url) {
     const fart = new Audio(url);
     fart.preservesPitch = false;
@@ -222,14 +230,30 @@ function fireEvents() {
 let shaking = false;
 let counter = 0;               // TODO: DONT FORGET TO SET TO 0 ON RELEASE!!!
 
+
+clickMe.addEventListener('keydown', (event) => {
+    if (event.key === 'Enter' && event.repeat) {
+        event.preventDefault()
+        return;
+    }
+}) 
 // TODO: change it to onmousedown (it stopped working after separating button and label)
-clickMe.onclick = () => {
+clickMe.addEventListener('click', () => {
     counter += 1;
     popupText.innerText = counter + "🍑💨";
     fireEvents();
-};
+}) 
+
+
+theme.addEventListener('click', (e) => {
+    root.className = e.target.id
+    localStorage.setItem('theme', e.target.id)
+})
+
+
 
 let prevTimestamp = 0;
+
 function frame(timestamp) {
     const deltaTime = (timestamp - prevTimestamp)/1000;
     prevTimestamp = timestamp;
@@ -242,11 +266,15 @@ function frame(timestamp) {
         clickMe.style.left = "50%";
         clickMe.style.top  = "50%";
     }
-    window.requestAnimationFrame(frame);
+    requestAnimationFrame(frame);
 }
-window.requestAnimationFrame((timestamp) => {
+
+requestAnimationFrame((timestamp) => {
     prevTimestamp = timestamp;
-    window.requestAnimationFrame(frame);
+    requestAnimationFrame(frame);
 });
 
-fireEvents();
+;(() => {
+    handleTheme();
+    fireEvents();
+})();
diff --git a/main.css b/main.css
index 5982113..cde6bd0 100644
--- a/main.css
+++ b/main.css
@@ -1,6 +1,31 @@
+:root {
+  --bg-color: #ffffff;
+  --bg-color-2: #ededed;
+  --bg-hover-color: #dbdbdb;
+  --font-color: #151515;
+  --border-color: #86868657;
+}
+:root.dark {
+  --bg-color: #0d1117;
+  --bg-color-2: #181e29;
+  --bg-hover-color: #141922;
+  --font-color: #EEF1F3;
+  --border-color: #30363d;
+}
+:root.poop {
+  --bg-color: #4f3324;
+  --bg-color-2: #754809;
+  --bg-hover-color: #4c4535;
+  --font-color: #b8b6b3;
+  --border-color: #2b1605;
+}
+
+
 body {
+  background-color: var(--bg-color);
   margin: 0;
 }
+
 .center {
     position: absolute;
     left: 50%;
@@ -9,6 +34,19 @@ body {
     width: 10%;
     height: 8%;
 }
+
+#clickMe {
+    background-color: var(--bg-color-2);
+    border: 1px solid var(--border-color);
+    border-radius: 3px;
+
+}
+
+#clickMe:hover {
+    background-color: var(--bg-hover-color);
+}
+
+
 #clickMeText {
     position: absolute;
     left: 50%;
@@ -18,6 +56,7 @@ body {
     text-wrap: nowrap;
     user-select: none;
     -webkit-user-select: none;
+    color: var(--font-color)
 }
 #critImg {
   opacity: 0;
@@ -40,6 +79,7 @@ body {
     top: 10px;
     width: 100px;
     height: 100px;
+    background-color: var(--bg-color);
 }
 #popupText {
     display: inline-block;
@@ -50,6 +90,7 @@ body {
     transform: translate(-25%, -50%);
     font-size: 48px;
     user-select: none;
+    color: var(--font-color)
 }
 .customCursor {
     cursor: url("peach-emoji.png"), auto;
@@ -67,3 +108,54 @@ body {
         transform: translate(-50%, -50%) scale(0.5, 0.5) rotate(360deg);
     }
 }
+
+/* theme */
+.nav {
+    position: absolute;
+    right: 0;
+    top: 0;
+}
+#night-mode-btn {
+    anchor-name: --anchor-dark-mode;
+}
+.nav-btn-style {
+    background: var(--bg-color-2);
+    border: none;
+    font-size: 16px;
+    padding: 8px 12px;
+    border-radius: 7px;
+    font-weight: 500;
+    color: var(--font-color);
+    border: 1px solid var(--border-color);
+    cursor: pointer;
+}
+.nav-btn-style:hover {
+    background-color: var(--bg-hover-color);
+}
+.popover-wrapper {
+    position-anchor: --anchor-dark-mode;
+    position-area: bottom span-left;
+    width: calc(anchor-size(width) * 1.5);
+    margin: 0;
+    border: none;
+    background-color: var(--bg-color-2);
+    border: 1px solid var(--border-color);
+    color: var(--font-color);
+}
+.theme {
+    display: flex;
+    flex-flow: column wrap;
+    align-items: stretch;
+    justify-content: center;
+}
+.popover-btn-style {
+    text-align: left;
+    background-color: var(--bg-color-2);
+    color: var(--font-color);
+    border: none;
+    padding: 10px;
+    cursor: pointer;
+}
+.popover-btn-style:hover {
+    background-color: var(--bg-hover-color);
+}
\ No newline at end of file