Learn CSS Flexbox by Building a Photo Gallery - Step 20

I couldn’t pass this last step, please help, what is query

   **Your code so far**
/* file: index.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: styles.css */
* {
 box-sizing: border-box;
}

body {
 margin: 0;
 font-family: Arial;
 background: #EBE7E7;
}

.header {
 text-align: center;
 padding: 32px;
 background: #E0DDDD;
}

#gallery {
 display: flex;
 flex-direction: row;
 flex-wrap: wrap;
 justify-content: center;
 align-items: center;
 padding: 0 4px;
}

#gallery img {
 width: 25%;
 height: 300px;
 object-fit: cover;
 margin-top: 8px;
 padding: 0 4px;
 border-radius: 10px;
}

@media(max-width:800px)
#gallery-img {
 width:50%;
 
}
   **Your browser information:**

User Agent is: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_6) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/15.5 Safari/605.1.15

Challenge: Learn CSS Flexbox by Building a Photo Gallery - Step 20

Link to the challenge:

Couple of syntax issues here.
You may wanna look at this article:

Also, I see you created two similar threads about this issue.
Try not to do that, it may be confusing for other members of community