* {   margin: 0px;   padding: 0px; } nav { width:100%;   display:flex;     align-items: center;   justify-content: center;     background: rgb(255, 255, 255);     z-index:100; } nav a { font-size: 14px;   outline: none;   text-decoration: none !important;   text-transform: none;   font-family: arial;   transition: all .3s ease; } nav a:hover {   color: rgb(168, 142, 76) !important; } nav img {   margin-left:15px;   margin-right: 15px;   width:100px;   height:100px;  }      /*Flecha para hacer la pagina hacia arriba*/     .ir-arriba {        border:1px solid green;        border-radius:30%;        border-right:10%;         display:none;         padding:30px;         background-repeat: no-repeat;         font-size:20px;         color:black;         cursor:pointer;         position: fixed;         bottom:20px;         right:20px;         z-index: 2;     }

<header>           <nav>        <br> <br><br><br>        <br> <br><br><br>        <br> <br><br><br>        <br> <br><br><br>        <li style="display:inline-block;float:left; padding:10px; font-weight:bold;"><a style="color:black; " href="#">HOME</a></li>        <li style="display:inline-block;float:left; padding:10px; font-weight:bold;"><a style="color:black;"  href="#">PRODUCT</a>         <ul><li><a href="#">Link</a></li></ul>        <ul><li><a href="#">Link</a></li></ul>        <ul><li><a href="#">Link</a></li></ul>        <ul><li><a href="#">Link</a></li></ul>                        </li>        <li style="display:inline-block;float:left; padding:10px; font-weight:bold;"><a style="color:black;"  href="#">services</a></li>        <img src="img/logo.png" alt="eror">        <li style="display:inline-block;float:left; padding:10px; font-weight:bold;"><a style="color:black;"  href="#">blog</a></li>        <li style="display:inline-block;float:left; padding:10px; font-weight:bold;"><a style="color:black;"  href="#">shop</a></li>        <li style="display:inline-block;float:left; padding:10px; font-weight:bold;"><a style="color:black;"  href="#">contacts</a></li>                     </nav> <div class="container" id="video" style="height:1000px;"   data-vide-bg="video/1_1" data-vide-options="loop: false, muted: false, position: 0% 0%"> <h1>HOLA</h1>   </header>