Aprende CSS Flexbox construyendo una galería de fotos - Step 20

no puedo avanzar:
no entiendo que tengo que hacer, me pide: Create a media query for screens smaller than 800px in width. In that media query, create a #gallery img rule and set the width property to 50% . This will convert your gallery to a two-column layout.

  **Tu código hasta el momento**
/* 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;
}
**AQUI!!**
@media (max-width: 800px),{
width: 50%; 
}
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Desafío: Aprende CSS Flexbox construyendo una galería de fotos - Step 20

Enlaza al desafío:

create a #gallery img selector inside media query and move width property to it

@media (max-width: 800px) {
#gallery img {
width: 50%;
} **the answer :open_mouth: **
}
thanks!