Ayuda con el paso 8 de Learn CSS Flexbox by building a Photo Gallery

Me marca error, me dice que falta width property set to 25% .

   **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;
}

#gallery img  {
 width: 25%
height: 300px
}

missing semicolon in width and height

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