html - How to make a sticky navigation bar ? -


this code , hope guys me .

im trying create navigate bar stick on top of page , moves when user scroll down . 

<!doctype html>  <html>    <title>new technology planet</title>    <head>       <style>      header {      background-image : url("pic15.jpg");      color:white;      text-align:center;      padding:150px;  }              ul{      list-style-type: none;      margin: 0;      padding: 0;      overflow: hidden;      background-color: #333;  	  	  }    li {      float: left;      border-right:1px solid #bbb;  }    li.logo{       border-right: none;  	 font-family:impact, charcoal, sans-serif;  	 color:white;  	 font-size:40px;  	 margin-top: 15px;  	 padding-left:30px;  	 }      li:last-child {      border-right: none;  }    li {      display: block;      color: white;      text-align: center;      padding: 25px 30px;      text-decoration: none;  	font-size:20px;  }    li a:hover:not(.active) {      background-color: #111;  }    .active {      background-color: #4caf50;  }             #section {      width:350px;      float:center;      padding:10px;	 	   }  #footer {      background-image : url("pic17.jpg");      color:white;      clear:both;      text-align:center;      padding:100px;	 	   }    #header{      font-family: "comic sans ms", cursive, sans-serif;    }            </style>    	    </head>      <body>             <header>              <h1>new technology planet</h1>  			<p><h3>the website still under construction laith sj</h3></p>  			<p>teamspeak3 & websites hosting</p>              <p>our goal give best can do!</p>           </header>          		   		   		                            <!-- navagator start -->    			  <nav role='navigation'>                       <ul>                            <li class="logo">newtecplanet</li>                                                  <ul style="float:right;list-style-type:none;">  					        <li><a class="active" href="#home">home</a></li>                              <li><a href="#news">news|updates</a></li>                              <li><a href="#contact">products</a></li>  					        <li><a href="#login">signup | login</a></li>   							<li><a href="#about">about us</a></li>                              <li><a href="#about">contact us</a></li>                                                      </ul>                      </ul>  				 </nav>  			 <!-- navagattor end code -->    <!-- -->              		   		          <div id="section">           <h2>test</h2>           <p>test</p>           <p>test</p>           <p>test</p>           <p>test</p>           <p>test</p>           <p>test</p>           <p>test</p>           <p>test</p>           <p>test</p>           <p>test</p>           <p>test</p>           <p>test</p>           <p>test</p>           <p>test</p>           <p>test</p>           <p>test</p>           <p>test</p>                    </div>           	 <!-- last part of page -->  	   	  <div id="footer">          new technology planet        </div>  	    	    </body>  </html>

guys please feel free edit post if think there viewers , , hope if can edit code can works .

if need example im asking let me know , dont want post other websites dont break rules .

thank

create class sticky , give position:fixed. on scroll check window's & nav bar position assign class nav stick @ top of screen. see example below:

jsfiddle

var topnav = document.getelementbyid("topnav"),    stop = topnav.offsettop,    docbody = document.documentelement || document.body.parentnode || document.body,    hasoffset = window.pageyoffset !== undefined,    scrolltop;    window.onscroll = function(e) {    scrolltop = hasoffset ? window.pageyoffset : docbody.scrolltop;    if (scrolltop >= stop) {      topnav.classname = 'sticky';    } else {      topnav.classname = '';    }  }
  header {      background-image: url("pic15.jpg");      color: #5a4a4a;      text-align: center;    }    ul {      list-style-type: none;      margin: 0;      padding: 0;      overflow: hidden;      background-color: #333;    }    li {      float: left;      border-right: 1px solid #bbb;    }    li.logo {      border-right: none;      font-family: impact, charcoal, sans-serif;      color: white;      font-size: 40px;      margin-top: 15px;      padding-left: 30px;    }    li:last-child {      border-right: none;    }    li {      display: block;      color: white;      text-align: center;      padding: 25px 30px;      text-decoration: none;      font-size: 20px;    }    li a:hover:not(.active) {      background-color: #111;    }    .active {      background-color: #4caf50;    }    #section {      width: 350px;      float: center;      padding: 10px;    }    #footer {      background-image: url("pic17.jpg");      color: white;      clear: both;      text-align: center;      padding: 100px;    }    #header {      font-family: "comic sans ms", cursive, sans-serif;    }    .sticky {      position: fixed;      top: 0;      left: 0;      width: 100%;    }
<header>    <h1>new technology planet</h1>    <p>      <h3>the website still under construction laith sj</h3>    </p>    <p>teamspeak3 & websites hosting</p>    <p>our goal give best can do!</p>  </header>      <!-- navagator start -->    <nav role='navigation' id="topnav" class="">    <ul>      <li class="logo">newtecplanet</li>      <ul style="float:right;list-style-type:none;">        <li><a class="active" href="#home">home</a>        </li>        <li><a href="#news">news|updates</a>        </li>        <li><a href="#contact">products</a>        </li>        <li><a href="#login">signup | login</a>        </li>        <li><a href="#about">about us</a>        </li>        <li><a href="#about">contact us</a>        </li>        </ul>    </ul>  </nav>  <!-- navagattor end code -->    <!-- -->          <div id="section">    <h2>test</h2>    <p>test</p>    <p>test</p>    <p>test</p>    <p>test</p>    <p>test</p>    <p>test</p>    <p>test</p>    <p>test</p>    <p>test</p>    <p>test</p>    <p>test</p>    <p>test</p>    <p>test</p>    <p>test</p>    <p>test</p>    <p>test</p>    <p>test</p>    </div>      <!-- last part of page -->    <div id="footer">    new technology planet  </div>


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