The dropdown menu doesn’t appear when I pass the mouse on the navbar

Good day, I am trying to create a dropdown menu on my freshly new website but cannot find the reason as to why it does not appear. It should appear under “About” but when I click on it nothing appears! Could someone help me?

Maybe the problem has a link with the display:none// display:block?

the HTML code:

<!DOCTYPE html>
<html>
  <head>
    <!--writting font title-->
    <link rel="preconnect" href="https://fonts.googleapis.com">
    <link rel="preconnect" href="https://fonts.gstatic.com" crossorigin>
    <link href="https://fonts.googleapis.com/css2?family=Whisper&display=swap" rel="stylesheet">

    <link rel="stylesheet" type="text/css" href="style.css">    
  </head>



<body>

  <header>
    <div class="header">
      <div class="inner_header">
        <div class="logo_container">
          <h1>Céramique & Porcelaine</h1> 
        </div> 
      </div>      
    </div>
  </header>

  <div class="menu_navbar">
    <ul>
      <li><a class="active" href="#">Home</a></li>
      <li><a href="#">Gallery</a></li>
      <li><a href="#">About</a></li>
        <div class="sub_menu_navbar_1">
          <ul>
            <li><a href="#">The Shop</a></li>
            <li><a href="#">The Artist</a></li>
          </ul>
        </div>
      <li><a href="#">Contact</a></li>

    </ul>    
  </div>
</body>
</html>

CSS Code:

*{
    margin: 0;
    padding: 0;
    list-style: none;
    text-decoration: none;
    box-sizing: border-box;
}

body{
    background-color: #101010;
    background-size: cover;
    background-position: center;
    font-family: sans-serif;
}


.header{
   width: 100%;
   height: 200px;
   display: block;
   background-color: #101010;
}

.inner_header{
    width: 1000px;
    height: 100%;
    display: block;
    margin: 0 auto;
    background-color: red;
}

.logo_container{
    height: 100%;
    display: table;
    float: right;
    position:relative;
    right: 40%;
    
}

.logo_container h1{
    color: bisque;
    font-family: "Whisper", cursive;
    font-weight: 400;
    font-style: normal;
}

.menu_navbar{
    background: blue;
    text-align: center;
}

.menu_navbar ul{
    display: inline-flex;
    list-style: none;
    color: bisque;
    text-align: center;
}

.menu_navbar ul li {
    width: 120px;
    margin: 15px;
    padding: 15px;
}

.menu_navbar ul li a{
    text-decoration: none;
    color: bisque;
}

.active,.menu_navbar ul li:hover{
    background: transparent;   
}

.sub_menu_navbar_1{
    display:none;
}

.menu_navbar ul li:hover .sub_menu_navbar_1{
    display: block;
    position: absolute;
    background: blue;
    margin-top: 15px;
    margin-left: -15px; 
}

.menu_navbar ul li:hover .sub_menu_navbar_1 ul{
    display: block;
    margin: 10px;
    
}
The dropdown menu doesn’t appear when I pass the mouse on the navbar

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