How to make RWD multi-layer drop-down menu with HTML & CSS

Most of the adaptive RWD multi-level dropdown menus will use Javascript, but now we have a simpler option. Today I want to share with you how to use CSS and HTML to make an adaptive RWD multi-layer drop-down menu. Below is a screenshot of our completed menu effect.

PC version
PC version 



mobile phone version
mobile phone version

Codepen :https://codepen.io/codepen-io-kelly/pen/vYVYGNW

First Level Of HTML


<div class="main-menu">
   <input type="checkbox" id="toggler"> <!--diplay checked box-->
   <label for="toggler"><!--checked box connect to hamburger-->
       <div class="menu_btn">"><!--hamburger menu design-->
           <span> menu</span>       
           </div>   
       </label>
          
   <nav id="site-navigation" class="main-navigation">
			
       <ul id="primary-menu" class="menu">
          <li><a href="#">Home</a></li>
          <li><a href="#">Travel</a></li>
          <li><a href="#">Fashion</a></li>
          <li><a href="#">movie</a></li>
          <li><a href="#">Life-style</a></li>
          <li><a href="#">About</a></li>
       </ul>  
        
   </nav><!-- #site-navigation -->
</div>  <!-- main-menu -->

First Level Of CSS


body {
	padding:0;
	margin:0;
}
.main-menu {
    background-color:#fff; 
    height: 70px; /* the height of the navigation bar*/
    padding: 0 18px;
    display: flex; 
}
#toggler {
    display: none;/* hide checkbox*/
}
.menu_btn {
     width: 40px; /*The size of the hamburger menu*/
     height: 40px;
     background: black;
     display: block;
     position: absolute;
     top:16px;;/*location of hamburger menu*/
     left: 10px;
}
.menu_btn span {    /*Design inside the hamburger menu*/
     opacity: 50;
     width: 1px;
     height: 1px;
     display: block;
     overflow: hidden;           
}


/*Three horizontal lines in the hamburger menu*/
.menu_btn::before {   
     content: '';
     position: absolute;
     height: 2px;
     left: 2px;
     left: 2px;
     width: 36px;
     background: white;
     top: 0;
     bottom: 0;
     margin: auto;
     /*利用 box-shadow 設定另外兩根，
     陰影的好處在於可以使用影分身之術*/
     box-shadow: 0 8px 0 white, 0 -8px 0 white;
     /*x 軸不偏移，y軸偏移, 要否模糊, 色彩*/
}


.main-navigation ul {
     list-style: none;
     margin: 0;
     padding-left: 0;
}

.main-navigation li a {  /* text settings*/
     display: block;
     position: relative;
     text-decoration: none;
     font-size: 18px;  
     color: #000; 	/* color of text*/
     text-transform: uppercase;	 /* abc chang to ABC*/
}

.main-navigation li a:hover {  /* mouse button change color*/
     color:#2894FF;  /*the text*/
	 background-color: antiquewhite;/* the background*/
}

/*Screen display of the mobile version*/

@media screen and (max-width: 768px) {  
   .main-navigation {
        background-color: #fff;
        width: 100%;
        height:50vh;
        position: absolute;
        top:73px;
        left:0px;
        transform: translateY(-100%); /*close the menu*/
        z-index: -99;
        transition: .9s;
	}

   #toggler:checked ~ .main-navigation {
        transform: translateY(0); 
        /*Setting 0 here is to make the menu drop down 
        when the check box is clicked*/
   }
   .main-navigation ul li{ 
        padding:12px;  /* distance between menus*/
    }
}

/*Computer version screen presentation*/

@media screen and (min-width: 768px) {  
   .menu_btn {  
        display: none; /*hamburger menu disappear*/
    }
   .main-navigation ul {
        display:flex;  
        padding:15px; 
    }
}

Second Level Of HTML


<ul class="sub-menu">  <!--Secon level-->
       <li><a href="#">category-1</a></li>
       <li><a href="#">category-2</a></li>
       <li><a href="#">category-3</a>
           <ul class="sub-menu">  <!--three level-->
              <li><a href="#">item-1</a></li>
              <li><a href="#">item-2</a></li>
              <li><a href="#">item-3</a></li>		      
           </ul>
	  </li>
</ul>

Second Level OfCSS


.main-navigation ul ul,
.main-navigation ul ul ul {
     background-color:transparent;
     /*The background color is transparent,
     following the color of the previous layer*/ 
}

.main-navigation ul ul li:hover > ul, 
.main-navigation ul ul li.focus > ul 
 {   /* Mouse over to expand sub-menu*/
     display: block;
     left:130px; /*The position of the third menu*/
}

.main-navigation ul li:hover > ul, 
.main-navigation ul li.focus > ul 
{  /* Mouse over to expand sub-menu*/
     display: block;
     left: auto;  
 }  

.main-navigation ul ul {
	display: none;  /*hide submenu*/
}
.main-navigation li {
    position:relative;
    padding:0 12px;
}

/*PC version screen*/
@media screen and (min-width: 768px) {  
    .main-navigation ul ul {
          display:block;
          width:150px;
          padding-left:12px;
     }
                
    .main-navigation ul ul li{
	 	  padding:8px;          
     }
     
    .main-navigation ul ul 
    {  /*The position of the second menu*/
       box-shadow: 0 3px 3px rgba(0, 0, 0, 0.5);
       float: left;
       position: absolute;
       top: 100%;
       left: -999em;
       z-index: 99;
	   background-color:#E0E0E0; 
    }

   .main-navigation ul ul ul 
   {   /*The position of the third menu*/
    	background-color:#E0E0E0;    
        top: 30px;
        left: -999em;
                
    }
}

ALL Of HTML


<div class="main-menu">
   <input type="checkbox" id="toggler"> 
   <label for="toggler">
       <div class="menu_btn">">
           <span> menu</span>       
           </div>   
       </label>
          
  <nav id="site-navigation" class="main-navigation">
			
     <ul id="primary-menu" class="menu">
        <li><a href="#">Home</a></li>
        <li><a href="#">Travel</a></li>
        <li><a href="#">Fashion</a></li>
        <li><a href="#">movie</a></li>
        <li><a href="#">Life-style</a>
              <ul class="sub-menu">  
                 <li><a href="#">category-1</a></li>
                 <li><a href="#">category-2</a></li>
                 <li><a href="#">category-3</a>
                    <ul class="sub-menu"> 
                       <li><a href="#">item-1</a></li>
                       <li><a href="#">item-2</a></li>
                       <li><a href="#">item-3</a></li>		      
                    </ul>
                 </li>
              </ul>
        </li>
        <li><a href="#">About</a></li>
     </ul>  
        
  </nav><!-- #site-navigation -->
</div>  <!-- main-menu -->

ALL Of CSS


body {
	padding:0;
	margin:0;
}
.main-menu {
    background-color:#fff; 
    height: 70px;
    padding: 0 18px;
    display: flex; 
}
#toggler {
    display: none;
}
.menu_btn {
     width: 40px;
     height: 40px;
     background: black;
     display: block;
     position: absolute;
     top:16px;;
     left: 10px;
}
.menu_btn span {    
     opacity: 50;
     width: 1px;
     height: 1px;
     display: block;
     overflow: hidden;           
}

.menu_btn::before {   
     content: '';
     position: absolute;
     height: 2px;
     left: 2px;
     left: 2px;
     width: 36px;
     background: white;
     top: 0;
     bottom: 0;
     margin: auto;
     /*利用 box-shadow 設定另外兩根，
     陰影的好處在於可以使用影分身之術*/
     box-shadow: 0 8px 0 white, 0 -8px 0 white;
     /*x 軸不偏移，y軸偏移, 要否模糊, 色彩*/
}


.main-navigation ul {
     list-style: none;
     margin: 0;
     padding-left: 0;
}

.main-navigation ul ul,
.main-navigation ul ul ul {
     background-color:transparent;
     
}

.main-navigation ul ul li:hover > ul, 
.main-navigation ul ul li.focus > ul { 
     display: block;
     left:130px; 
}

.main-navigation ul li:hover > ul, 
.main-navigation ul li.focus > ul { 
     display: block;
     left: auto;  
 }  

.main-navigation ul ul {
	display: none;
}
.main-navigation li {
    position:relative;
    padding:0 12px;
}

.main-navigation li a { 
     display: block;
     position: relative;
     text-decoration: none;
     font-size: 18px;  
     color: #000; 	
     text-transform: uppercase;	 
}

.main-navigation li a:hover { 
     color:#2894FF;
	 background-color: antiquewhite;
}

/*Screen display of the mobile version*/

@media screen and (max-width: 768px) {  
   .main-navigation {
        background-color: #fff;
        width: 100%;
        height:50vh;
        position: absolute;
        top:73px;
        left:0px;
        transform: translateY(-100%); 
        z-index: -99;
        transition: .9s;
	}

   #toggler:checked ~ .main-navigation {
        transform: translateY(0); 
   }
   .main-navigation ul li{ 
        padding:12px;  
    }
}

/*Computer version screen presentation*/

@media screen and (min-width: 768px) {  
   .menu_btn {  
        display: none; 
    }
   .main-navigation ul {
        display:flex;  
        padding:15px; 
    }
    
    .main-navigation ul ul {
          display:block;
          width:150px;
          padding-left:12px;
     }
                
    .main-navigation ul ul li{
	 	  padding:8px;          
     }
     
    .main-navigation ul ul 
    {  
       box-shadow: 0 3px 3px rgba(0, 0, 0, 0.5);
       float: left;
       position: absolute;
       top: 100%;
       left: -999em;
       z-index: 99;
	   background-color:#E0E0E0; 
    }

   .main-navigation ul ul ul 
   {  
    	background-color:#E0E0E0;    
        top: 30px;
        left: -999em;
                
    }
}
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