diff --git a/Ex3_Box model and positioning/3-5/default.html b/Ex3_Box model and positioning/3-5/default.html
new file mode 100644
index 0000000..74df642
--- /dev/null
+++ b/Ex3_Box model and positioning/3-5/default.html	
@@ -0,0 +1,24 @@
+<!DOCTYPE html>
+<html>
+<head>
+    <meta charset="utf-8"/>
+    <meta name="viewport" content="width=device-width"/>
+    <style>
+        h1 {
+            display: inline;
+        }
+        p {
+            display: inline-block;
+        }
+        a {
+            display: block;
+        }
+    </style>
+</head>
+<body>
+    <h1>h has block property. But go to inline.</h1>
+    <p>p has block property. But go to inline-block</p>
+    <a>a has inline propery. But go to block.</a>
+    <span>span has inline property</span>
+</body>
+</html>
\ No newline at end of file
