What am I doing wrong tho?

Tell us what’s happening:
Describe your issue in detail here.
i added the src attribute to the img elements but it tells me that there’s something wrong.

  **Your code so far**
\ file: <!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Photo Gallery</title>
  <link rel="stylesheet" href="./styles.css">
</head>
<body>
  <div class="header">
    <h1>CSS FLEXBOX PHOTO GALLERY</h1>
  </div>
  <div id="gallery">
    <img src=https://cdn.freecodecamp.org/curriculum/css-photo-gallery/1.jpg/>
    <img src=https://cdn.freecodecamp.org/curriculum/css-photo-gallery/2.jpg/>
    <img src=https://cdn.freecodecamp.org/curriculum/css-photo-gallery/3.jpg/>
    <img src=https://cdn.freecodecamp.org/curriculum/css-photo-gallery/4.jpg/>
    <img src=https://cdn.freecodecamp.org/curriculum/css-photo-gallery/5.jpg/>
    <img src=https://cdn.freecodecamp.org/curriculum/css-photo-gallery/6.jpg/>
    <img src=https://cdn.freecodecamp.org/curriculum/css-photo-gallery/7.jpg/>
    <img src=https://cdn.freecodecamp.org/curriculum/css-photo-gallery/8.jpg/>
    <img src=https://cdn.freecodecamp.org/curriculum/css-photo-gallery/9.jpg/>
    <img src=https://cdn.freecodecamp.org/curriculum/css-photo-gallery/10.jpg/>
  </div>
</body>
</html>
<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Photo Gallery</title>
  <link rel="stylesheet" href="./styles.css">
</head>
<body>
  <div class="header">
    <h1>CSS FLEXBOX PHOTO GALLERY</h1>
  </div>
  <div id="gallery">
    <img src=https://cdn.freecodecamp.org/curriculum/css-photo-gallery/1.jpg/>
    <img src=https://cdn.freecodecamp.org/curriculum/css-photo-gallery/2.jpg/>
    <img src=https://cdn.freecodecamp.org/curriculum/css-photo-gallery/3.jpg/>
    <img src=https://cdn.freecodecamp.org/curriculum/css-photo-gallery/4.jpg/>
    <img src=https://cdn.freecodecamp.org/curriculum/css-photo-gallery/5.jpg/>
    <img src=https://cdn.freecodecamp.org/curriculum/css-photo-gallery/6.jpg/>
    <img src=https://cdn.freecodecamp.org/curriculum/css-photo-gallery/7.jpg/>
    <img src=https://cdn.freecodecamp.org/curriculum/css-photo-gallery/8.jpg/>
    <img src=https://cdn.freecodecamp.org/curriculum/css-photo-gallery/9.jpg/>
    <img src=https://cdn.freecodecamp.org/curriculum/css-photo-gallery/10.jpg/>
  </div>
</body>
</html>
\ file: 

  **Your browser information:**

User Agent is: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/101.0.4951.64 Safari/537.36 Edg/101.0.1210.53

Challenge: Step 6

Link to the challenge:

The attribute value should be inside “double quotes”.