Technical Documentation

The users story is asking me to :
“On regular sized devices (laptops, desktops), the element with id="navbar" should be shown on the left side of the screen and should always be visible to the use”

I have tried putting
navbar {
position: fixed;
}
in css but it doesnt work.

could someone help me out?

Here is my code.

  * {
    box-sizing: border-box;
  }

  body {
    font-family: Arial;
    padding: 10px;
    background: #f1f1f1;
  }

  /* Header/Blog Title */
  .header {
    padding: 30px;
    text-align: center;
    background: white;
  }

  .header h1 {
    font-size: 50px;
  }
  

  /* Style the top navigation bar */
  .topnav {
    overflow: hidden;
    background-color: #333;
  }

  /* Style the topnav links */
  .topnav a {
    float: left;
    display: block;
    color: #f2f2f2;
    text-align: center;
    padding: 14px 16px;
    text-decoration: none;
    
  }

  /* Change color on hover */
  .topnav a:hover {
    background-color: #ddd;
    color: black;
    position: fixed;
  }

  #navbar{
    position: fixed;
  }
  
  /* Create two unequal columns that floats next to each other */
  /* Left column */
  .leftcolumn {
    float: left;
    width: 25%;
  }

  /* Right column */
  .rightcolumn {
    float: left;
    width: 75%;
    background-color: #f1f1f1;
    padding-left: 20px;
  }

  /* Fake image */
  .fakeimg {
    background-color: #aaa;
    width: 100%;
    padding: 20px;
  }

  /* Add a card effect for articles */
  .card {
    background-color: white;
    padding: 20px;
    margin-top: 20px;
  }

  /* Clear floats after the columns */
  .row:after {
    content: "";
    display: table;
    clear: both;
  }
 

  /* Footer */
  .footer {
    padding: 20px;
    text-align: center;
    background: #ddd;
    margin-top: 20px;
  }

  /* Responsive layout - when the screen is less than 800px wide, make the two columns stack on top of each other instead of next to each other */
  @media screen and (max-width: 800px) {
    .leftcolumn, .rightcolumn {
      width: 100%;
      padding: 0;
    }
  }

  /* Responsive layout - when the screen is less than 400px wide, make the navigation links stack on top of each other instead of next to each other */
  @media screen and (max-width: 400px) {
    .topnav a {
      float: none;
      width: 100%;
    }
  }

please post the link to the challenge (and post your HTML code too)