Aşağıdaki kodlarda video altında beyazlık kalıyor (video tam ekranı kaplamıyor altta ufak bir yer kalıyor).Yardımcı olabilecek var mı?
body{
margin:0;padding:0;

}

#hero video{
height:100vh;
width:100%;
background-position:absolute; 
z-index:10; 
object-fit:cover;

}

#hero .content {
  
  height:100%;
  width:100%;
  z-index:20;
  position:absolute;
  top:0;
  left:0;
  text-align:center;

}

#hero .content h1 {
  color:white;
  font-family:Ink Free,sans-serif;
  padding-top:15px;
  float: left;
  padding-left: 25px;
}

<!DOCTYPE html>
<html>
<head>
    <title></title>
    <link rel="stylesheet" href="main.css"/>
 <!--    <link rel="stylesheet" href="bootstrap.css"/> -->
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css" integrity="sha384-Gn5384xqQ1aoWXA+058RXPxPg6fy4IWvTNh0E263XmFcJlSAwiGgFAW/dAiS6JXm" crossorigin="anonymous">

</head>
<body>

<div id="hero">
    
<video autoplay="" loop="" muted="">
    <source src="2back.mp4" type="video/mp4">
</video>

<div class="content">
       <!-- <div class="container">
        
     <h1>  <button>   Roadmap   </button>         </h1>  
           <h1>  <button> Whitepaper  </button> </h1>
           <h1>  <button>  Contract  </button> </h1>
           <h1>   <button>  Community  </button> </h1>
-->

  <nav class="navbar navbar-black bg-black navbar-expand-lg text-white"> 

     <div class="container">  

          <a href="#" class="navbar-brand">
<img src="logo.png" width="100" height="100" alt="">
            W
          </a>    

     <button class="navbar-toggler" data-toggle="collapse" data-target="#navbar-w" aria-controls="navbar-w" > 
      <span class="navbar-toggler-icon" ></span>
     </button>


     <div class="collapse navbar-collapse" id="navbar-w">
       
      <ul class="navbar-nav ml-auto">
        
          <li class="nav-item"> <a href="" class="nav-link px-3">  Deneme  </a></li>

           <li class="nav-item"> <a href="" class="nav-link px-3">Deneme</a></li>

            <li class="nav-item"> <a href="" class="nav-link">Deneme</a></li>
      </ul>

      </div>

     </div>

  </nav>

    <!--    </div> -->
    </div>


</div>

<script src="https://code.jquery.com/jquery-3.2.1.slim.min.js" integrity="sha384-KJ3o2DKtIkvYIK3UENzmM7KCkRr/rE9/Qpg6aAZGJwFDMVNA/GpGFF93hXpG5KkN" crossorigin="anonymous"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.12.9/umd/popper.min.js" integrity="sha384-ApNbgh9B+Y1QKtv3Rn7W3mgPxhU9K/ScQsAP7hUibX39j7fakFPskvXusvfa0b4Q" crossorigin="anonymous"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/js/bootstrap.min.js" integrity="sha384-JZR6Spejh4U02d8jOt6vLEHfe/JQGiRRSQQxSfFWpi1MquVdAyjUar5+76PVCmYl" crossorigin="anonymous"></script>
</body>



</html>