Bootstrap snippet and html example. Responsive layout

<ul class="sidenav">
  <li><a  href="#home" id="title">Bettaibi Nidhal</a></li>
  <li><a  href="#home">Home</a></li>
  <li><a href="#news">News</a></li>
  <li><a  class="active" href="#home">Deseign</a></li>
  <li><a href="#news">Intership</a></li>
  <li><a href="#news">Dev</a></li>
  <li><a  href="#home">General</a></li>
</ul>

<div class="main">
    <div id="myAside" class="aside">
  <a href="javascript:void(0)" class="closebtn" onclick="closeAside()">&times;</a>
  <div class="aside-content">
    <p>
      AsideBar Content
    </p>

  </div>
</div>

<div class="topnav">
  <a class="active" href="#home">Home</a>
  <a href="#news">News</a>
  <a href="#contact">Contact</a>
  <a href="#about">About</a>
  <a href="javascript:void(0)" style="float: right; margin-right:14%;" onclick="openNav()"><span>&#9776;</span></a>
</div>

<div class="content" id="main">
  <h2>Responsive Layout Exemple </h2>
  <p>
    Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.
     Ut enim ad minim veniam,
    quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.
  </p>
  <p>
    Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.
     Ut enim ad minim veniam,
    quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.
    Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.
     Ut enim ad minim veniam,
    quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.
    Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.
     Ut enim ad minim veniam,
    quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.
  </p>
  <p>
    Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.
     Ut enim ad minim veniam,
    quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.
  </p>


</div>

</div>

body {
    margin: 0;
    background: #fff;
    font-family: NotoSansJP,Slack-Lato,appleLogo,sans-serif;
    color: #2c2d30;
  }

ul.sidenav {
    list-style-type: none;
    margin: 0;
    padding: 0;
    width: 14%;
    background-color: #4d394b;
    position: fixed;
    height: 100%;
    overflow: auto;
    visibility: visible;
}
ul.sidenav li a {
    display: block;
    padding: 8px 16px;
    color: rgb(184,176,183);
    text-decoration: none;
    text-transform: capitalize;
}

ul.sidenav li a.active {
    background-color: #4C9689;
    color: white;
}

ul.sidenav li a:hover:not(.active) {
    background-color: #362434;
}
#title{
  text-align: center;
  padding: 15px 18px;
  text-decoration: none;
  font-size: 18px;
  font-weight: bold;
  border-bottom: 1px solid #3e323d;
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -webkit-box-flex: 1;
  -ms-flex: 1;
  flex: 1;
  margin-bottom: 18px;
}
@media screen and (max-width: 300px) {
    ul.sidenav {
        width: 100%;
        height: auto;
        position: relative;
    }
    ul.sidenav li a {
        float: left;
        padding: 15px;
    }
    div.content {margin-left: 0;}
}

@media screen and (max-width: 300px) {
    ul.sidenav li a {
        text-align: center;
        float: none;
    }
}

div.content {
    margin-left: 14%;
    padding: 72px 20px;
    transition: margin-right .5s;
}

/* Nav Bar */
.topnav {
    position: fixed;
    top: 4px;
    left: 14%;
    width: 100%;
    background-color: #fff;
    box-shadow: 0px 1px 0px #edeaec;
    overflow: hidden
}

.topnav a {
  float: left;
  color: #717274;
  text-align: center;
  padding: 14px 18px;
  text-decoration: none;
  font-size: 17px;
  display: flex;
  flex: 1;
}
/* Aside Bar */
.aside {
    height: 100%;
    width: 0;
    position: fixed;
    z-index: 1;
    top: 58px;
    right: 0;
    background-color: #fff;
    overflow-x: hidden;
    overflow-y: auto;
    transition: 0.5s;
    padding: 50px 0px;
    border-left: 1px solid #edeaec;
}
.aside-content{
  padding: 0px 13px 10px 13px;
  text-decoration: none;
  font-size: 19px;
  color: #717274;
  display: block;
  transition: 0.5s;
}
.aside a {
    padding: 0px 0px 10px 13px;
    text-decoration: none;
    font-size: 19px;
    color: #717274;
    display: block;
    transition: 0.5s;
}
.aside .closebtn {
  position: absolute;
  top: 0;
  right: 5px;
  font-size: 29px;
}

  // Close  AsideBar
   function closeAside(){
    document.getElementById("myAside").style.width = "0";
    document.getElementById("main").style.marginRight= "0";
    }
    
    // Open AsideBar
    function openNav() {
    document.getElementById("myAside").style.width = "300px";
    document.getElementById("main").style.marginRight = "300px";
  }