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HTML

              
                <div class="container">

  <div class="logo">STARRY<br>NIGHT</div>
  <div class="right" data-animation="to-bottom">
    <a data-text="ABOUT US" href="#" style="transition-delay: 250ms;">BOOKS</a>
    <a data-text="EQUIPMENT" href="#" style="transition-delay: 500ms;">MOVIES</a>
    <a data-text="TOURS" href="#" style="transition-delay: 750ms;">VIDEO GAMES</a>
    <a data-text="CONTACT" href="#" style="transition-delay: 1000ms;">CONTACT</a>

    <div id="snow"></div>
    <div id="snow2"></div>
    <div id="snow3"></div>
  </div>
  <div id="menuBtn">
    <input type="checkbox" />
    <span></span>
    <span></span>
    <span></span>
    <span></span>
  </div>

  <div id="stars"></div>
  <div id="stars2"></div>
  <div id="stars3"></div>

  <div id="moon">
    <ul>
      <li>
      <li>
      <li>
      <li>
      <li>
    </ul>
  </div>

  <div class="bat-cont">
    <div class="bat">
      <div class="wing-left"></div>
      <div class="wing-right"></div>
      <div class="head">
        <div class="ears"></div>
        <div class="eyes"></div>
        <div class="mouth"></div>
      </div>
    </div>
  </div>

  <div class="bat-cont bat2">
    <div class="bat">
      <div class="wing-left"></div>
      <div class="wing-right"></div>
      <div class="head">
        <div class="ears"></div>
        <div class="eyes"></div>
        <div class="mouth"></div>
      </div>
    </div>
  </div>
</div>
              
            
!

CSS

              
                //******************************************************

// Like it if you like it :) Thank you 
// Best viewed in fullscreen
// https://codepen.io/nocni_sovac/full/qBZNZBz

//******************************************************

* {
  padding:0;
  margin:0;
}
@import url('https://fonts.googleapis.com/css2?family=Mountains+of+Christmas:wght@700&family=Skranji:wght@700&display=swap');

body{
  background: #3d3d3d;
  font-family: 'Mountains of Christmas', cursive;
  overflow: hidden;
}


.container {
  display: flex;
  flex-direction: row;
  overflow: hidden;
  justify-content: center;
  align-items: center;
  
  
  .bat-cont {
    position: absolute;
    left: 58px;
    top: 99px;
    transition: all 1.5s linear;
    
  .bat {
    animation: bat 1.5s infinite, bat-updown .4s infinite, bat-forthback 10s infinite;
    position: absolute;
    top: 35px;
    
     @-webkit-keyframes bat {
        0% {
         transform: rotate(-7deg);
        }

        50% {
         transform: rotate(7deg);
        }

        100%{
        transform: rotate(-7deg);
       }
      }
      @-webkit-keyframes bat-updown {
          0% {     
           top:-35;
          }
          50% {    
           top:0;
          }
          100%{
          top:35; 
         }
        }
    
     @-webkit-keyframes bat-forthback {
          0% {     
           transform:scale(1);
          }
          20% {    
          transform:scale(1.2);
          }
          40% {    
          transform:scale(2);
          }
          60% {    
          transform:scale(0.5);
          }
          80% {    
          transform:scale(0.9);
          }
       
        100% {    
          transform:scale(1);
          }
        }
    
    
    .wing-left {
        width: 0;
        height: 0;
        border-top: 24px solid transparent;
        border-bottom: 24px solid transparent;
        border-left: 44px solid black;
        position: absolute;
        top: 27px;
        left: -28px;
       animation: wing1 .3s infinite;
    }
    
      @-webkit-keyframes wing1 {
        0% {
         transform: rotate(7deg);
        }

        50% {
         transform: rotate(-7deg);

        }

        100%{
        transform: rotate(7deg);
        }
      }
    .wing-right {
             width: 0;
          height: 0;
          border-top: 24px solid transparent;
          border-bottom: 24px solid transparent;
          border-right: 44px solid black;
          position: absolute;
          top: 27px;
          left: 26px;
       animation: wing2 .3s infinite;
    }
      @-webkit-keyframes wing2 {
        0% {
         transform: rotate(-7deg);
        }

        50% {
         transform: rotate(7deg);

        }

        100%{
        transform: rotate(-7deg);
        }
      }
    .head {
      height: 96px;
      width: 44px;
     background: radial-gradient(circle, rgba(23,23,33,1) 0%, rgba(20,20,23,1) 35%, rgba(0,0,0,1) 100%);

      /* border-radius: 42px 64px 68px 46px; */
      -moz-transform: scaleY(0.4);
      -webkit-transform: scaleY(0.4);
      border-radius: 50%;
      position: relative;
      
      .ears {
        &::before {
            content: '';
            width: 0;
            height: 0;
            border-left: 6px solid transparent;
            border-right: 14px solid transparent;
            border-bottom: 37px solid black;
            position: absolute;
            top: -11px;
            transform: rotate(-14deg);
        }
        
        &::after {
            content: '';
            width: 0;
            height: 0;
            border-left: 6px solid transparent;
            border-right: 7px solid transparent;
            border-bottom: 36px solid black;
            position: absolute;
            top: -20px;
            left: 28px;
            transform: rotate(10deg);
        }
      }
      
      .eyes {
        height: 16px;
            width: 7px;
            background: silver;
            border-radius: 100%;
            position: absolute;
            top: 28px;
            position: absolute;
            left: 10px;
        
        &::after {
          content:'';
          height: 16px;
          width: 7px;
          background: silver;
          border-radius: 100%;
          position: absolute;
          top: 1px;
          position: absolute;
          left: 13px;
        }
        
      }
      
      .mouth {
        width: 18px;
        height: 4px;
        background: silver;
        top: 67px;
        position: absolute;
        left: 13px;
        border-radius: 100%;
        
        &::before {
          content: '';
          width: 0;
          height: 0;
          border-left: 3px solid transparent;
          border-right: 3px solid transparent;
          border-top: 16px solid silver;
          position: absolute;
        }
        
        &::after {
          content: '';
          width: 0;
          height: 0;
          border-left: 3px solid transparent;
          border-right: 3px solid transparent;
          border-top: 16px solid silver;
          position: absolute;
          left: 12px;
        }
      }
      
    }
  }
    
    &.bat2{
      top: 258px !important;
      right: 59px !important;
      position: absolute;
    }
    
  }
  
 
  
  .logo {
    position: absolute;
    top: 14px;
    left: 30px;
    text-align: center;
    font-family: 'Poppins', sans-serif;
    font-size: 30px;
    line-height: 21px;
    z-index: 99;
    color: white;
     font-family: 'Mountains of Christmas', cursive;
    
    &::after {
          content: "Gift Shop";
    position: absolute;
    font-family: initial;
    font-size: 17px;
    width: 100%;
    bottom: -26px;
    left: 1px;

    }
  }
   
  #menuBtn {
    position: absolute;
    top:15px;
    right:25px;
    cursor: pointer;
    display: flex;
    flex-direction: column;
    align-items: center;
    z-index: 99;
    height: auto;
    
    input {
      display: block;
      cursor: pointer;
      position: absolute;
      height: 100%;
      width: 100%;
      opacity:0;
      z-index:9;
      
      &:checked ~ span {      
        &:nth-child(2){
          opacity:0;
          transform: scale(0)
        }
        &:nth-child(3){
         transform: rotate(45deg)
        }
        
        &:nth-child(4){
          display: block;
          transform: rotate(135deg);
          opacity:1;
          margin-top: -3px;
        }
        &:nth-child(5){
          opacity:0;
          transform: scale(0)
        }
        
       
      }
    }
    
    span {
      width:35px;
      height:3px;
      background: white;
      position:relative;
      display:block;
      margin: 4px 0;
      border-radius: 2px;
      transition: all .2s linear;
      
      &:nth-child(3) {
        width:25px;
        margin-bottom: auto;
      }
      &:nth-child(4) {
        width:25px;
        opacity:0;
        margin:0;
      }
    }
       
  }
      
  .right { 
    height: 100vh;
    width:100vw;
    position: relative;
    transition: all .4s linear;
    // transform: translateY(-100vh);
    opacity: 0;
    background: RGBA(0,0,0,1);
    display: flex;
    justify-content: center;
    align-items: center;
    flex-direction: column;
    z-index: 9;
    
    a {
      text-decoration: none;
      display:block;
      font-weight: 900;
      font-size: 70px;
      color: white;
      -webkit-text-stroke: 2px white;
      text-stroke: 2px white;
      -webkit-text-fill-color: transparent;
       background-size: 200% 100%;
      background-position: 100%;
      position: relative;
      transition: all .5s linear;
      opacity:0;
      
      @media only screen and (max-width: 768px) {
        font-size: 40px;
      }
      
      &:hover {
         opacity:1;
         animation: shake 0.5s;
      }
      
      @keyframes shake {
       0%{
          transform: scale(0.8) translate3d(0,0,0);
        }
        50%{
          transform: scale(1.1);
        }
        80%{
          transform: scale(0.89);
        }
        100%{
          transform: scale(1) translate3d(0,0,0);
        }
      }
    }
    
    
    
@function multiple-box-shadow ($n) {
  $value: '#{random(2000)}px #{random(4000)}px #FFFAFA';
  @for $i from 2 through $n{
    $value: '#{$value} , #{random(2000)}px #{random(2000)}px #FFFAFA';
  }
  @return unquote($value)
}

$shadows-small:  multiple-box-shadow(700);
$shadows-medium: multiple-box-shadow(400);
$shadows-big: multiple-box-shadow(200);
    
 #snow {
  width: 2px;
  height: 2px;
  background: transparent;
  box-shadow: $shadows-small;
  animation	: animStar linear infinite;
  animation-duration: 20s; 
  border-radius:100%;
  position: absolute;
  left:0;
   
  &:after {
    content: " ";
    position: absolute;
    top: -2000px;
    width: 2px;
    height: 2px;
    background: transparent;
    box-shadow: $shadows-small;
    border-radius:100%;
  }
} 
#snow2 {
  width: 4px;
  height: 4px;
  background: transparent;
  box-shadow: $shadows-medium;
  animation	: animStar linear infinite;
  animation-duration: 20s; 
  border-radius:100%; 
  position: absolute;
  left:0;  
  
  &:after {
    content: " ";
    position: absolute;
    top: 2000px;
    width: 4px;
    height: 4px;
    background: transparent;
    box-shadow: $shadows-medium;
    border-radius:100%;
  }
}
#snow3{
  width: 6px;
  height: 6px;
  background: transparent;
  box-shadow: $shadows-big;
  animation: animStar linear infinite;
 animation-duration: 20s; 
  border-radius:100%;
   position: absolute;
  left:0;
 
  &:after{
    content: " ";
    position: absolute;
    top: -2000px;
    width: 6px;
    height: 6px;
    background: transparent;
    box-shadow: $shadows-big;
    border-radius:100%;
  }
}

    
@keyframes animStar {
  from	{
    transform: translateY(0px);
  }
  to {		
    transform: translateY(2000px); 
  }
}
    
    
  }
  

#moon {
  height: 105px;
  width: 105px;
  background-color: #eee;
  border-radius: 139px 131px 141px 131px;
  top: 30%;
  left: 50%;
  transform: translateX(-50%) scale(2.1);
  box-shadow: inset 0px 0px 0px 0px rgba(54, 50, 50, 0.75), 0px 0px 56px rgba(255, 255, 255, 0.75);
  position: absolute;
  display: inline-block;  
  
  li{
    position: absolute;
    list-style: none;
    background: #B9DAD7;
    border-radius: 50%;
  }
  li:nth-child(1) {
    top:1.15em;
    left:1.25em;
    height:.75em;
    width:.75em;
  }
  li:nth-child(2) {
    top:1.05em;
    left:3.5em;
    height:1.25em;
    width:1.25em;
  }
  li:nth-child(3) {
    top:2.95em;
    left:1.1em;
    height:1.75em;
    width:1.75em;
  }
  li:nth-child(4) {
    top:3em;
    left:3.25em;
    height:.5em;
    width:.5em;
  }

}

.main-cont {
  display:flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  position: absolute;
  bottom: 12%;
  left: 50%;
  transform: translateX(-50%);
}

// Stars

@function generateStart ($n) {
  $value: '#{random(2000)}px #{random(2000)}px rgba(165,190,195,#{random(10)/10})';
  @for $i from 0 through $n{
    $value: '#{$value} , #{random(2000)}px #{random(2000)}px rgba(165,190,195,#{random(10)/10})';
  }
  @return unquote($value)
}

$shadows-small:  generateStart(400);
$shadows-medium: generateStart(300);
$shadows-big: generateStart(200);


#stars {
  width: 2px;
  height: 2px;
  box-shadow: $shadows-small;
  background: transparent;
  border-radius:100%;
  animation: blink 5s infinite;
  position: absolute;
  left: 0;
  top: 0;
} 

#stars2 {
  width: 3px;
  height: 3px;
  box-shadow: $shadows-medium;
  background: transparent;
  border-radius:100%;
  animation: blink 10s infinite;
  position: absolute;
  left: 0;
  top: 0;
} 

#stars3 {
  width: 4px;
  height: 4px;
  box-shadow: $shadows-big;
  background: transparent;
  border-radius:100%;
  animation: blink 5s infinite;
  position: absolute;
  left: 0;
  top: 0;
} 

@keyframes blink {
  0% {
    opacity:1;
  }
  
  50% {
    opacity:0.2;
  }
  
  100% {
    opacity: 1;
  }
}



}
  
              
            
!

JS

              
                let btn = document.getElementById('menuBtn');
let left = document.querySelector('.left');
let right = document.querySelector('.right');
let links = document.querySelectorAll('.right a');

let bat1  = document.querySelector('.bat-cont');
let bat2  = document.querySelector('.bat2');

let flag = true;

btn.addEventListener("click", ()=>{
    flag = !flag;
    if(!flag){
      right.style.opacity = "1";
      for(let i = 0; i < links.length; i++){
        links[i].style.opacity = "0.7";
      }
    } else {

      right.style.opacity = "0";
      for(let i = 0; i < links.length; i++){
        links[i].style.opacity = "0";
      }
    }
     
})

let width = window.innerWidth < 768 ? 400 : 1800;
let h = setInterval(function () {
   
   bat1.style.top = Math.floor((Math.random() * 800) + 1)+"px"; 
   bat1.style.left = Math.floor((Math.random() * width) + 1)+"px";
  
   bat2.style.top = Math.floor((Math.random() * 800) + 1)+"px"; 
   bat2.style.left = Math.floor((Math.random() * width) + 1)+"px";
}, 1500)



              
            
!
999px

Console