diff --git a/mai-birthday-2021/audio.mp3 b/mai-birthday-2021/audio.mp3
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diff --git a/mai-birthday-2021/function.js b/mai-birthday-2021/function.js
new file mode 100644
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--- /dev/null
+++ b/mai-birthday-2021/function.js
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+alert("Chạm vào bánh kem 🎂 và tận hưởng bữa tiệc nào!!! 🎶🎉🎊");
+window.addEventListener("click", function () {
+  var audio = document.getElementById("HBD");
+  audio.play();
+});
diff --git a/mai-birthday-2021/image.gif b/mai-birthday-2021/image.gif
new file mode 100644
index 0000000..e76d1eb
Binary files /dev/null and b/mai-birthday-2021/image.gif differ
diff --git a/mai-birthday-2021/index.html b/mai-birthday-2021/index.html
new file mode 100644
index 0000000..e60876b
--- /dev/null
+++ b/mai-birthday-2021/index.html
@@ -0,0 +1,52 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <title>Happy Birthday Trúc Mai</title>
+    <meta charset="UTF-8" />
+    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
+    <link
+      href="https://fonts.googleapis.com/css?family=Pacifico&display=swap"
+      rel="stylesheet"
+    />
+    <link rel="stylesheet" href="style.css" />
+  </head>
+
+  <body>
+    <div class="wish">Happy Birthday Trúc Mai</div>
+    <div class="cake">
+      <div class="layer"></div>
+      <div class="icing">
+        <div class="name">
+          <p>
+            Happy Birthday<br />
+            <span id="name">Mama</span>
+          </p>
+        </div>
+      </div>
+      <div class="candle1">
+        <div class="flame1"></div>
+      </div>
+      <div class="candle2">
+        <div class="flame2"></div>
+      </div>
+      <div class="candle3">
+        <div class="flame3"></div>
+      </div>
+      <div class="candle4">
+        <div class="flame4"></div>
+      </div>
+      <div class="candle5">
+        <div class="flame5"></div>
+      </div>
+    </div>
+    <div class="text">
+      Chúc cho mama của Vy luôn luôn vui vẻ, gặp nhiều điều may, tốt nghiệp đúng
+      hạn^^
+    </div>
+
+    <audio id="HBD" loop>
+      <source src="audio.mp3" />
+    </audio>
+    <script src="function.js" type="text/javascript"></script>
+  </body>
+</html>
diff --git a/mai-birthday-2021/style.css b/mai-birthday-2021/style.css
new file mode 100644
index 0000000..1652b0f
--- /dev/null
+++ b/mai-birthday-2021/style.css
@@ -0,0 +1,224 @@
+body {
+  background-image: url("image.gif");
+}
+
+.wish {
+  margin: 0;
+  padding: 0;
+  position: absolute;
+  top: 4%;
+  width: 100%;
+  text-align: center;
+  font-size: 3em;
+  color: red;
+  letter-spacing: 0.1em;
+  font-family: "Pacifico", cursive;
+  background: -webkit-linear-gradient(#ffff00, #ff1493);
+  -webkit-background-clip: text;
+  -webkit-text-fill-color: transparent;
+  -webkit-animation: hue 3s infinite ease-in-out;
+}
+
+@-webkit-keyframes hue {
+  0% {
+    -webkit-filter: hue-rotate(0deg);
+    transform: scale(1) rotate(0deg);
+  }
+
+  50% {
+    -webkit-filter: hue-rotate(360deg);
+    transform: scale(1.2) rotate(5deg);
+  }
+}
+
+.cake {
+  position: absolute;
+  width: 250px;
+  height: 200px;
+  top: 50%;
+  left: 50%;
+  margin-top: -70px;
+  margin-left: -125px;
+}
+
+.plate {
+  position: absolute;
+  width: 290px;
+  height: 130px;
+  bottom: -10px;
+  left: -15px;
+  background-color: #ccc;
+  border-radius: 25%;
+  box-shadow: 0 5px 0 0 #000;
+}
+
+.cake > * {
+  position: absolute;
+}
+
+.layer {
+  position: absolute;
+  display: block;
+  width: 250px;
+  height: 100px;
+  border-radius: 25%;
+  background-color: #2a0a0a;
+  border: 3px solid #fff;
+  box-shadow: 0 15px 0 0 #2a0a0a, 0 30px 0 0 #2a0a0a, 0 33px 0 0 #fff,
+    0 45px 0 0 #2a0a0a, 0 60px 0 0 #2a0a0a, 0 63px 0 0 #fff, 0 75px 0 0 #2a0a0a,
+    0 90px 0 0 #2a0a0a;
+}
+
+.icing {
+  top: 3px;
+  left: 3px;
+  background-color: #fff;
+  border: 5px dotted #2a0a0a;
+  width: 240px;
+  height: 90px;
+  border-radius: 25%;
+}
+
+.name {
+  margin: 0;
+  padding: 0;
+  position: absolute;
+  top: 10%;
+  width: 100%;
+  text-align: center;
+  font-size: 1em;
+  color: #2a0a0a;
+  font-family: "Pacifico", cursive;
+}
+
+.candle1 {
+  z-index: 10;
+  width: 10px;
+  height: 50px;
+  background-color: #fe2e2e;
+  border-radius: 4px;
+  top: -25px;
+  left: 50%;
+  margin-left: -8px;
+}
+
+.flame1 {
+  border-bottom-left-radius: 45% 35%;
+  border-bottom-right-radius: 45% 35%;
+  box-shadow: 0 -15px 2px 2px #ffc205;
+  background-color: yellow;
+  border-radius: 50%;
+  height: 30px;
+  width: 5px;
+  top: -30px;
+  left: 30%;
+  position: absolute;
+}
+
+.candle2 {
+  z-index: 10;
+  width: 10px;
+  height: 50px;
+  background-color: #fe2e2e;
+  border-radius: 4px;
+  top: -25px;
+  left: 80%;
+  margin-left: -8px;
+}
+
+.flame2 {
+  border-bottom-left-radius: 45% 35%;
+  border-bottom-right-radius: 45% 35%;
+  box-shadow: 0 -15px 2px 2px #ffc205;
+  background-color: yellow;
+  border-radius: 50%;
+  height: 30px;
+  width: 5px;
+  top: -30px;
+  left: 30%;
+  position: absolute;
+}
+
+.candle3 {
+  z-index: 10;
+  width: 10px;
+  height: 50px;
+  background-color: #fe2e2e;
+  border-radius: 4px;
+  top: -25px;
+  left: 20%;
+  margin-left: -8px;
+}
+
+.flame3 {
+  border-bottom-left-radius: 45% 35%;
+  border-bottom-right-radius: 45% 35%;
+  box-shadow: 0 -15px 2px 2px #ffc205;
+  background-color: yellow;
+  border-radius: 50%;
+  height: 30px;
+  width: 5px;
+  top: -30px;
+  left: 30%;
+  position: absolute;
+}
+
+.candle4 {
+  z-index: 10;
+  width: 10px;
+  height: 50px;
+  background-color: #fe2e2e;
+  border-radius: 4px;
+  top: 15px;
+  left: 15%;
+  margin-left: -8px;
+}
+
+.flame4 {
+  border-bottom-left-radius: 45% 35%;
+  border-bottom-right-radius: 45% 35%;
+  box-shadow: 0 -15px 2px 2px #ffc205;
+  background-color: yellow;
+  border-radius: 50%;
+  height: 30px;
+  width: 5px;
+  top: -30px;
+  left: 30%;
+  position: absolute;
+}
+
+.candle5 {
+  z-index: 10;
+  width: 10px;
+  height: 50px;
+  background-color: #fe2e2e;
+  border-radius: 4px;
+  top: 15px;
+  left: 85%;
+  margin-left: -8px;
+}
+
+.flame5 {
+  border-bottom-left-radius: 45% 35%;
+  border-bottom-right-radius: 45% 35%;
+  box-shadow: 0 -15px 2px 2px #ffc205;
+  background-color: yellow;
+  border-radius: 50%;
+  height: 30px;
+  width: 5px;
+  top: -30px;
+  left: 30%;
+  position: absolute;
+}
+
+.text {
+  margin: 0;
+  padding: 0;
+  position: absolute;
+  top: 80%;
+  width: 100%;
+  text-align: center;
+  font-size: 2em;
+  color: white;
+  font-family: "Pacifico", cursive;
+}