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HTML

              
                <div>
  <p id="error">E<span>r</span>ror</p>
  <p id="code">4<span>0</span><span>4</span></p>
</div>


<!-- Created by ARiyou2000 -->
              
            
!

CSS

              
                /* You can change Font size in Line 32 & 37 */

body { 
  
/*   Background - Model 1 - Simple */
/*   background-color: #111111; */
  
/*   Background - Model 2 - Wallpaper */      /*Default  Active*/
  background-image: url("https://images.weserv.nl/?url=i.imgur.com/6QJjYMe.jpg");
      
/*   Background - Model 3 - Wallpaper */
/*   background-image: url("https://cdn.pixabay.com/photo/2017/02/12/12/42/wall-2059909_960_720.png"); */
  
/*   Background - Model 4 - Wallpaper */
/*   background-image: url("https://fintechrockers.com/wp-content/uploads/2017/05/wall-2059909.png") */
/*   background-image: url("https://cdn.pixabay.com/photo/2017/02/12/12/42/wall-2059909_960_720.png") */
      
     
/*   Backgroun Image Settings: */
  background-repeat: repeat-y;
  background-position: center;
  background-size: cover;
  
/*   Optional Overflow */
  overflow: hidden
    
    height:100%;
}

/* Error Font Size */
#error {
  font-size: 120px;
}

/* Code Font Size */
#code {
  font-size: 120px;
}

div {
  padding: 40px;
/*   font-size: 120px; */
  font-family: 'Monoton', cursive;
  text-align: center;
  text-transform: uppercase;
  text-shadow: 0 0 80px red,0 0 30px FireBrick,0 0 6px DarkRed;
  color: red;
}

div p { 
  margin:0; 
}

#error:hover { 
  text-shadow: 0 0 200px #ffffff,0 0 80px #008000,0 0 6px #0000ff; 
}

#code:hover { 
  text-shadow: 0 0 100px red,0 0 40px FireBrick,0 0 8px DarkRed;
}

#error {
  color: #fff;
  text-shadow: 0 0 80px #ffffff,0 0 30px #008000,0 0 6px #0000ff;
}

#error span {
  animation: upper 11s linear infinite;
}

#code span:nth-of-type(2) {
  animation: lower 10s linear infinite;
}

#code span:nth-of-type(1) {
  text-shadow: none;
  opacity:.4;
}

@keyframes upper {
  0%,19.999%,22%,62.999%,64%, 64.999%,70%,100% {
    opacity:.99; text-shadow: 0 0 80px #ffffff,0 0 30px #008000,0 0 6px #0000ff;
  }
  20%,21.999%,63%,63.999%,65%,69.999% {
    opacity:0.4; text-shadow: none; 
  }
}

@keyframes lower {
  0%,12%,18.999%,23%,31.999%,37%,44.999%,46%,49.999%,51%,58.999%,61%,68.999%,71%,85.999%,96%,100% {
    opacity:0.99; text-shadow: 0 0 80px red,0 0 30px FireBrick,0 0 6px DarkRed;
  }
  19%,22.99%,32%,36.999%,45%,45.999%,50%,50.99%,59%,60.999%,69%,70.999%,86%,95.999% { 
    opacity:0.4; text-shadow: none; 
  }
}



/* Copy-right by ARiyou2000 in May2020*/
              
            
!

JS

              
                // ⟁ \\

//All of code done in HTML and CSS(SCSS).

//Code by ARiyou2000
              
            
!
999px

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