Learn CSS Colors by Building a Set of Colored Markers - Step 50

i can not find where in my code is wrong. I am passing the linear-gradient as requested but it’s not passing in tests. Someone could enlight me?

// here is my piece code
.red {
background: linear-gradient(90deg, #f00, #0f0)
}

<!-- file: index.html -->
<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Colored Markers</title>
    <link rel="stylesheet" href="styles.css">
  </head>
  <body>
    <h1>CSS Color Markers</h1>
    <div class="container">
      <div class="marker red">
      </div>
      <div class="marker green">
      </div>
      <div class="marker blue">
      </div>
    </div>
  </body>
</html>
/* file: styles.css */
h1 {
  text-align: center;
}

.container {
  background-color: rgb(255, 255, 255);
  padding: 10px 0;
}

.marker {
  width: 200px;
  height: 25px;
  margin: 10px auto;
}


/* User Editable Region */

.red {
  background: linear-gradient(90deg, #f00, #0f0)
}

/* User Editable Region */


.green {
  background-color: #007F00;
}

.blue {
  background-color: hsl(240, 100%, 50%);
}

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Challenge Information:

Learn CSS Colors by Building a Set of Colored Markers - Step 50

Just remove the color values in the linear-gradient and it will work. This particular step is only asking you to set the gradient-direction to 90deg. The step to add colors will soon follow.
All the best!