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+<!DOCTYPE html>
+<html lang="en">
+<head>
+    <meta charset="UTF-8">
+    <meta http-equiv="X-UA-Compatible" content="IE=edge">
+    <meta name="viewport" content="width=device-width, initial-scale=1.0">
+    <title>Document</title>
+    <style>
+        * {
+            box-sizing: border-box; 
+        }
+
+        .left{
+            background-color: lightblue;
+            padding: 20px;
+            width: 20%;
+            float: left;
+        }
+        .main{
+            background-color: lightgray;
+            padding: 20px;
+            width: 60%;
+            float: left;
+        }
+        .right{
+            background-color: lightgreen;
+            padding: 20px;
+            width: 20%;
+            float: left;
+        }
+
+
+        @media screen and (max-width: 800px) {
+            .left, .main, .right {
+                width: 100%;
+            }
+        }
+
+    </style>
+</head>
+<body>
+    <h1 style="font-size: 10vw;">Responzivní web</h1>
+    <div>
+        <div class="left">
+            <p>TEXT</p>    
+        </div>
+        <div class="main">
+            <p>TEXT</p>
+        </div>
+        <div class="right">
+            <p>TEXT</p>
+        </div>
+    </div>
+    <picture>
+        <source srcset="image_01.jpg"
+            media="(max-width: 600px)">
+        <source srcset="image_02.jpg"
+            media="(max-width: 1000px)">
+        <source srcset="image_03.jpg">
+        <img src="image_01.jpg" 
+            alt="Obrazek1" 
+            style="width: 100%">
+    </picture>
+
+    
+</body>
+</html>
\ No newline at end of file
