JSFiddle - React, Tailwind, and code Playground

HTML

<body id="bodyMain">
    <div class ="index">
            <div id="menu"> 
              <div id = "divlang">
              <a href="index.php?language=en"> <img id="langicon" src="img/ENG_icon.png"/>  </a> 
              <a href="index.php?language=ita"> <img id="langicon" src="img/ITA_icon.png"/> </a> 
            </div>
            </br>
              <a id="hiddenmenu" href="#">&#9776; </a>
              <ol id="list">
                <li class="listitem" id="listHome"> Home
                </li>                
                <li class="listitemLOG" id="listInsertENG"> Insert
              </li>
                <li class="listitem" id="listShowENG"> Show
              </li>
                <li class="listitem" id="listSearchENG"> Search
              </li>
                <li class="listitemVOID"> 
              </li>              
                <li class="listitem" id="listInfoENG"> Info
              </li>
                <li class="listitem" id="listPubbENG"> Pubblications
              </li>
                <li class="listitem" id="listPhotoENG"> Photo
              </li>
                <li class="listitem" id="listLinkENG"> Link
              </li>
                <li class="listitem" id="listContactENG"> Contacts
              </li>
                <li class="listitemVOID"> 
              </li>  
              <li class="listitem" onclick='showLog()' id="buttonlogin"> Login
              </li>
             <form action='' method='POST' class='listitemLOG'>
                    <button type='submit' class ='bottone_logout' name='Logout' id='Logout'> Logout </button>
                </form>           
              <li class="listitemADM" id="listReservedArea"> Reserved Area
              </li>
              <div id="login_div";>
                <fieldset>
                  <legend> <b> Login </b> </legend>
                  <form action="" method="POST" class="login">
                      <p>
                          <label>Username</label>
       ...

CSS

.index{
	width :100%;
	margin-top:2%;
	/*border-color:#000;
	border:solid;*/
	clear:both;

}

#menu{
	float:left;
	width:22%;
	margin:1%;
}

#content{
	float:right;
	width:75%;
	margin-right: 1%;
	word-wrap: break-word;

}

JavaScript

$("#listInfo").click(function(){
    	$("#content").load('view/info.html');
    	document.title = 'Info';
    });

   $("#listLink").click(function(){
    	$("#content").load('view/link.html');
    	document.title = 'Link';
    });

   $("#listContact").click(function(){
    	$("#content").load('view/contacts.html');
    	document.title = 'Contacts';
    });