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About the <head>

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CSS

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JavaScript

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HTML 

              
                <!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>HM3</title>
    <link rel="stylesheet" href="style.css">
</head>
<body>
    <input type="checkbox" class="toggler">
    <div class="hamburger"><div></div></div>
    <div class="menu">
        <div>
            <ul>
                <li><a href='#'>Home</a></li>
                <li><a href='#'>About</a></li>
                <li><a href='#'>Services</a></li>
                <li><a href='#'>Contact</a></li>
            </ul>
        </div>
    </div>
</body>
</html>
!

CSS 

              
                *{
    margin: 0;
    padding: 0;
}

body{
    background: #333;
    height: 100vh;
    width: 100vw;
}

.toggler{
  /* ALWAYS KEEPING THE TOGGLER OR THE CHECKBOX ON TOP OF EVERYTHING :  */
    z-index:2;
    height: 50px;
    width: 50px;
    position: absolute;
    top: 0;
    left: 0;
    cursor: pointer;
    opacity: 0;
}

.hamburger{
    position: absolute;
    top: 0;
    left: 0;
    height: 40px;
    width: 40px;
    padding: 0.6rem;
  
  /* FOR DISPLAYING EVERY ELEMENT IN THE CENTER : */
  
    display: flex;
    align-items: center;
    justify-content: center;
}

/* CREATING THE MIDDLE LINE OF THE HAMBURGER : */

.hamburger > div{
    position: relative;
    top: 0;
    left: 0;
    background: white;
    height: 2px;
    width: 60%;
    transition: all  0.4s ease;
}

/* CREATING THE TOP AND BOTTOM LINES : 
TOP AT -10PX ABOVE THE MIDDLE ONE AND BOTTOM ONE IS 10PX BELOW THE MIDDLE: */

.hamburger > div::before,
.hamburger > div::after{
    content: '';
    position: absolute;
    top: -10px;
    background: white;
    width: 100%;
    height: 2px;
    transition: all  0.4s ease;
}

.hamburger > div::after{
    top: 10px;
}

/* IF THE TOGGLER IS IN ITS CHECKED STATE, THEN SETTING THE BACKGROUND OF THE MIDDLE LAYER TO COMPLETE BLACK AND OPAQUE :  */

.toggler:checked + .hamburger > div{
    background: rgba(0,0,0,0);
}

.toggler:checked + .hamburger > div::before{
    top: 0;
    transform: rotate(45deg);
    background: black;
}

/* AND ROTATING THE TOP AND BOTTOM LINES :  */

.toggler:checked + .hamburger > div::after{
    top: 0;
    transform: rotate(135deg);
    background: black;
}


/* MAIN MENU WITH THE WHITE BACKGROUND AND THE TEXT :  */

.menu{
    background: white;
    width: 0%;
    height: 100vh;
  
  /* APPLYING TRANSITION TO THE MENU :  */
  
    transition: all 0.4s ease;
}

/* IF THE TOGGLER IS CHECKED, THEN INCREASE THE WIDTH OF THE MENU TO 30% , CREATING A SMOOTH EFFECT :  */

.toggler:checked ~ .menu{
    width: 30%;
}


/* STYLING THE LIST :  */

.menu >  div > ul{
    display: flex;
    flex-direction: column;
    position: fixed;
    top: 70px;
    padding-left: 10px;
  
  /* HIDDEN INITIALLY  :  */
  
    visibility: hidden;
}

.menu > div > ul > li{
    list-style: none;
    padding: 0.5rem;
}

.menu > div > ul > li > a{
    color: black;
    text-decoration: none;
    font-size: 2rem;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

/* WHEN THE TOGGLER IS CHECKED, CHANGE THE VISIBILITY TO VISIBLE :  */

.toggler:checked ~ .menu > div > ul{
    transition: visibility 0.4s ease;
    transition-delay: 0.1s;
    visibility: visible;
}

.toggler:checked ~ .menu > div > ul > li > a:hover{
    color: orange;
}
!

JS 

              
                // NOTHING HERE, ONLY HTML AND CSS REQUIRED :
!
999px

Console