<!DOCTYPE html>
<html>
    <head>
        <title>
          Octoberfest
      </title>
      <link href="https://fonts.googleapis.com/css?family=Courgette|Open+Sans&display=swap" rel="stylesheet"> 
    </head>
    <body>
        
    <section>
    <h2>
       Hello October!
      </h2>
  </div>
     <div class="leaf">
     <div>  <img src="http://www.pngmart.com/files/1/Fall-Autumn-Leaves-Transparent-PNG.png" height="75px" width="75px"></img></div>
      <div><img src="http://www.pngmart.com/files/1/Autumn-Fall-Leaves-Pictures-Collage-PNG.png" height="75px" width="75px"></img></div>
      <div>  <img src="http://www.pngmart.com/files/1/Autumn-Fall-Leaves-Clip-Art-PNG.png" height="75px" width="75px" ></img></div>
      <div><img  src="http://www.pngmart.com/files/1/Green-Leaves-PNG-File.png" height="75px" width="75px"></img></div>
       <div> <img src="http://www.pngmart.com/files/1/Transparent-Autumn-Leaves-Falling-PNG.png" height="75px" width="75px"></img></div>
     <div>   <img src="http://www.pngmart.com/files/1/Realistic-Autumn-Fall-Leaves-PNG.png" height="75px" width="75px"></div>
     <div><img src="http://cdn.clipart-db.ru/rastr/autumn_leaves_025.png" height="75px" width="75px"></div>
            
     </div>
     
     <div class="leaf leaf1">
     <div>  <img src="http://www.pngmart.com/files/1/Fall-Autumn-Leaves-Transparent-PNG.png" height="75px" width="75px"></img></div>
      <div><img src="http://www.pngmart.com/files/1/Autumn-Fall-Leaves-Pictures-Collage-PNG.png" height="75px" width="75px"></img></div>
      <div>  <img src="http://www.pngmart.com/files/1/Autumn-Fall-Leaves-Clip-Art-PNG.png" height="75px" width="75px" ></img></div>
      <div><img  src="http://www.pngmart.com/files/1/Green-Leaves-PNG-File.png" height="75px" width="75px"></img></div>
       <div> <img src="http://www.pngmart.com/files/1/Transparent-Autumn-Leaves-Falling-PNG.png" height="75px" width="75px"></img></div>
     <div>   <img src="http://www.pngmart.com/files/1/Realistic-Autumn-Fall-Leaves-PNG.png" height="75px" width="75px"></div>
     <div><img src="http://cdn.clipart-db.ru/rastr/autumn_leaves_025.png" height="75px" width="75px"></div>
            
     </div>
     
     <div class="leaf leaf2">
     <div>  <img src="http://www.pngmart.com/files/1/Fall-Autumn-Leaves-Transparent-PNG.png" height="75px" width="75px"></img></div>
      <div><img src="http://www.pngmart.com/files/1/Autumn-Fall-Leaves-Pictures-Collage-PNG.png" height="75px" width="75px"></img></div>
      <div>  <img src="http://www.pngmart.com/files/1/Autumn-Fall-Leaves-Clip-Art-PNG.png" height="75px" width="75px" ></img></div>
      <div><img  src="http://www.pngmart.com/files/1/Green-Leaves-PNG-File.png" height="75px" width="75px"></img></div>

       <div> <img src="http://www.pngmart.com/files/1/Transparent-Autumn-Leaves-Falling-PNG.png" height="75px" width="75px"></img></div>
     <div>   <img src="http://www.pngmart.com/files/1/Realistic-Autumn-Fall-Leaves-PNG.png" height="75px" width="75px"></div>
     <div><img src="http://cdn.clipart-db.ru/rastr/autumn_leaves_025.png" height="75px" width="75px"></div>
            
     </div>
     </section>

    </body>
</html>
body {
margin:0;
padding:0;
overflow:hidden;
background-color:black;
}
section{
height:100%;
width:100%;
  position:absolute ;  background:radial-gradient(#333,#000);
}
.leaf{
    position:absolute ;
    width:100%;
    height:100%;
    top:0;
    left:0;
}
.leaf div{
position:absolute ;
display:block ;
}
.leaf div:nth-child(1){
    left:20%; 
    animation:fall 15s linear infinite ;
    animation-delay:-2s;

}
.leaf div:nth-child(2){
    left:70%; 
    animation:fall 15s linear infinite ;
    animation-delay:-4s;
}
.leaf div:nth-child(3){
    left:10%; 
    animation:fall 20s linear infinite ;
    animation-delay:-7s;
    
}
.leaf div:nth-child(4){
    left:50%; 
   animation:fall 18s linear infinite ; 
   animation-delay:-5s;
}
.leaf div:nth-child(5){
    left:85%; 
    animation:fall 14s linear infinite ;
    animation-delay:-5s;
}
.leaf div:nth-child(6){
    left:15%; 
    animation:fall 16s linear infinite ;
    animation-delay:-10s;
}
.leaf div:nth-child(7){
    left:90%; 
    animation:fall 15s linear infinite ;
    animation-delay:-4s;
}

@keyframes fall{
    0%{
        opacity:1;
        top:-10%;
        transform:translateX (20px) rotate(0deg);
    }
    20%{
        opacity:0.8;
        transform:translateX (-20px) rotate(45deg);
    }
    40%{

        transform:translateX (-20px) rotate(90deg);
    }
    60%{
        
       transform:translateX (-20px) rotate(135deg); 
    }
    80%{
    
        transform:translateX (-20px) rotate(180deg);
    }
    100%{
        
        top:110%;
        transform:translateX (-20px) rotate(225deg);
    }
    }
.leaf1{
    transform: rotateX(180deg);
}
h2{
    position:absolute ;
    top:40%;
    width:100%;
    font-family: 'Courgette', cursive;
    font-size:4em;
    text-align:center;
    transform:translate ;
    color:#fff;
    transform:translateY (-50%);
}

External CSS

This Pen doesn't use any external CSS resources.

External JavaScript

This Pen doesn't use any external JavaScript resources.