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HTML

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Adding Classes

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About the <head>

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Insecure Resource

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CSS

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CSS preprocessors help make authoring CSS easier. All of them offer things like variables and mixins to provide convenient abstractions.

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CSS Base

About CSS Base

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Vendor Prefixing

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JavaScript

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JavaScript preprocessors can help make authoring JavaScript easier and more convenient.

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Babel includes JSX processing.

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HTML 

              
                <body>

<header></header>
<nav>
  <ul>
    <li><a href="https://wiki.selfhtml.org/wiki/HTML/Seitenstrukturierung/nav">Home</a></li>
    <li><a href="https://wiki.selfhtml.org/wiki/HTML/Tutorials/HTML5-Seitenstrukturierung">About Us</a></li>
    <li><a href="#">Contact</a></li>
  </ul>
</nav>


<aside id="externalLinks">
<ul>
  <li class="dropdown">
    <a href="#" class="dropbtn">Computer</a>
     <div class="dropdown-content">
       <a href="#">Hardware</a>
       <a href="#">Software</a>
       <a href="#">Network</a>
       <a href="#">Infrastructure</a>
	  </div>	 
  <li><a href="#">News</a></li>
  <li><a href="#">Bucher</a></li>
    
</ul>
</aside>
<main>
  <p>Bitte geben deine kommentar</p> 
<form action="http://www.dw-formmailer.de/cgi-bin/dwmailer/dwmailer.pl" method="post" enctype="multipart/form-data">
	<input name="empfaenger_mail" value="bWVpbm5hbWVAYW5iaWV0ZXIuZGU=" type="hidden">
	<input name="pflicht" value="absender_vorname,absender_name,absender_nachricht" type="hidden">
	<p>Vorname *<br>
		<input placeholder="Vorname" name="absender_vorname" size="30" maxlength="50" type="text">
	</p>
	<p>E-Mail *<br>
		<input name="absender_mail" size="30" maxlength="50" type="email">
	</p>
	<p>Nachricht *<br>
		<textarea placeholder="Nachricht" name="absender_nachricht" rows="5" cols="40" maxlength="200" style="width: 678px; height: 203px;"></textarea>
	</p>
	<p>
		<input value="absenden" type="submit">
	</p>
</form>



</main>

<aside id="furtherInformation"></aside>

<footer id="copry" >
	<p>My Website: Linux and More  © 2018. All Rights Reserved.</p>	
<a id="img1" href="https://creativecommons.org/licenses/by-nc/4.0/"><img alt="Creative Commons License" width="120" height="40" src="/home/ilargi/Dokumente/HTML/Arbeit/Meine-web/CC-Lizenz.png" ></a> 
<p>This work is licensed under a Creative Commons Attribution-NonCommercial 4.0<br> International License.
	Content of this site cannot be republished<br> either online or offline without our permissions. </p>

</footer>
	
	
</body>	
</html>
!

CSS 

              
                body {
background-color: #ebf5d7;
grid-gap: 5px;
grid-template-columns: 10% 72% 17%;
grid-template-areas:
	
	
"header   header   header"   
"nav      nav      nav" 
"linkBox  linkBox  linkBox"	
"main     main     main"     
"infoBox  infoBox  infoBox"  
"footer   footer   footer" ;  
}
@media screen and (min-width: 40em) {
  body {
    display: grid;
    grid-template-columns: 10% 72% 17%;
      grid-template-areas:
  "header  header  header" 
  "nav     nav     nav"     
  "linkBox main    infoBox"
  "footer  footer  footer";
  }
}
body > header {
	grid-area: header;
	background-image: url("../meine2.png");
    padding: 60px;
}

body > nav {
	grid-area: nav;
	background-color: #d2f5c4;
	
}

body > #externalLinks {
	grid-area: linkBox;
	background-color:  #d2f3c6;
	;
}	
body > main {
	grid-area: main;
	background-color: #eaf6e5;
}

body > #furtherInformation {
	grid-area: infoBox;
	background-color: #d2f3c6;
}

body > footer {
	grid-area: footer;
	background-color: #99ee7a;
	
}


/* Nav  */

nav {background-color: #d2f5c4;}	

nav a{	
    color: black;
    text-decoration: none;
	display: inline;
	padding: 0px 8px;
	font-size: 17px;
	font-family:  Candara, Calibri, Segoe, "Segoe UI", Optima, sans-serif;
}    
	
nav ul {list-style-type: none;}   
 	
nav li {display: block;display:inline-block;}	   


/* ExternalLinks  */

#externalLinks a	{
	
    text-decoration: none;
	display: block;
	text-align: center;
	
    font-size: 15px;
	font-family: Candara, Calibri, Segoe, "Segoe UI", Optima, sans-serif;
}
	
#externalLinks ul {
	list-style-type: none;
	margin: 5px;
    padding: 0;
	
}

#externalLinks li{float: left}

/* Geben an Link1, link2, link3 ; Farbe , Padding, .... */


li a, .dropbtn {
    display: block;
    color: #000;
    padding: 8px 16px;
    text-decoration: none;
	
}

li a:hover, .dropdown:hover .dropbtn { background-color: #f1ebeb;}

.dropdown-content {
    display: none; /* display wird ausgeschaltet ,aber erlaubt die anderen elemente, position ,background ,.... */
    font-size: 15px;
	position: absolute; /* die stellung folgt der Erste Link(li) */
    background-color: #f1f1f1 ;
    min-width: 160px; /* macht größer die Inneren Links */
    box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.2); /* Bau ein Schatte und geben an dem Schatten Farbe  */
    z-index: 1;    /*  Zeigen die Ordnung wie die Links gezeigt werden... */
   
}

.dropdown-content a {
    color: black;
    padding: 12px 16px;
    text-decoration: none;               /* Bekomme die Liks keine Unten Stricht ....*/
    display: block;
}

.dropdown-content a:hover {
background-color: #9f9e9e;
}
/* Offnen die Innere Links */

.dropdown:hover .dropdown-content {
    display: block;
	 left: 109px;       /* zeigt wo dem innere link fenster gezeigt wird */ 
     top: 214px;       /* zeigt wo dem innere link fenster gezeigt wird */
	
}

/*    Main           */

input, textarea{
			background:rgba(220,220,220,0.75);
			border:1px solid rgba(220,220,220,0.75);
			font:inherit;
			border-radius:0.2941em;/*5px;*/
			padding:0.4118em;/*7px;*/
			/*farbigen Rahmen in Chrome und Safari abschalten.*/
			outline:none;
}
		
input:focus, textarea:focus{
			background:#fff;
			border:1px solid #000;
	        outline: none; /* einige Browser add line auf input , das verhindert es... */
}
input[type=submit]{
			background:#be633c;
			border:none;
			color:#fff;
			border-radius:50% 50%;
			box-shadow:inset 0 0 1em #fb9d23;
			padding:0.5882em;/*10px*/
}
input[type=submit]:focus, input[type=submit]:active{
		 background-color:#A33202;
}





/* Footer  */

#copry {
	overflow: auto;
	font-size: 2px;
    list-style-type: none;
	font-family:  Candara, Calibri, Segoe, "Segoe UI", Optima, sans-serif;

}	

#img1 {float: left;margin-bottom: 3px;}
#copry a {text-decoration: none;margin-bottom: 3px;}
#copry p {font-size: 10px;margin-bottom: 0;}
!

JS
!
999px

Console