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HTML

              
                <link href="https://fonts.googleapis.com/css?family=Merriweather:400,700" rel="stylesheet">
<div id="sparks"></div>
<h1>You shall not pass!..</h1>
<h3 class="four-zero-three"><span style="font-size: 50px;">403</span><br>Our ancient server knows that you want to access to our world but it has avoid it.</h3>
<div class="mask"></div>
<div id="forbidden" class="ancient-wizard wrapper">
  <svg  width="200" height="310" viewBox="0 0 52.916667 82.020842">
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            </g>
            <path d="m 132.40468,71.65738 4.23371,-2.350237 c 0.417,-2.148757 -0.083,-3.781735 -1.95679,-4.641933 -4.818,1.062586 -3.60608,2.561432 -5.40912,3.84214 z"/>
          </g>
        </g>
      </g>
    </g>
  </g>
</svg>
</div>
              
            
!

CSS

              
                body {
  background-color: #555;
}

h1, h3 {
  font-family: "Merriweather";
  display: block;
  width: fit-content;
  text-align: center;
  margin: 20px auto;
  padding: 5px;
  color: ;
  text-shadow: 1px 0px 10px gold;
}


svg {
  position: relative;
  top: 5px;
  left: calc(50% - 100px);
}

.ancient-wizard {
  background-color: rgba(240, 166, 2, .97);
  width: 400px;
  height: 320px;
  margin: 0px auto;
  border-radius: 45px;
  
}

#sparks{
    background-image: url('https://avatanplus.com/files/resources/original/584156887a295158bf3a0534.png'), url('https://avatanplus.com/files/resources/original/584156887a295158bf3a0534.png'), url('https://avatanplus.com/files/resources/original/584156887a295158bf3a0534.png');
  height: 100%;
  left: -10;
  position: absolute;
  top: 0;
  width: 100%;
  z-index:-10;
  -webkit-animation: sparks 10s ease infinite;
  -moz-animation: sparks 10s linear infinite;
  -ms-animation: sparks 10s bezier(2, 1, 2, 1) infinite;
  animation: sparks 10s ease-in infinite;
  filter: grayscale(90%);
}
@keyframes sparks {
  0% {background-position: 100px 0px, 0px 200px, 50px 0px;}
  50% {background-position: 500px 500px, 100px 200px, -100px 150px;}
  100% {background-position: 500px 1000px, 200px 400px, -100px 300px;}
}
@-moz-keyframes sparks {
  0% {background-position: 10px 120px, 0px 50px, 20px 60px;}
  30% {background-position: 500px 500px, 100px 200px, -100px 150px;}
  100% {background-position: 400px 1000px, 200px 400px, 100px 300px;}
}
@-webkit-keyframes sparks {
  0% {background-position: 0px 0px, 0px 0px, 0px 0px;}
  50% {background-position: 500px 500px, 100px 200px, -100px 150px;}
  100% {background-position: 500px 1000px, 200px 400px, -100px 300px;}
}
@-ms-keyframes sparks {
  0% {background-position: 0px 50px, 0px 0px, 100px 0px;}
  20% {background-position: 500px 500px, 100px 200px, -50px 100px;}
  60% {background-position: 500px 500px, 100px 200px, -100px 150px;}
  100% {background-position: 500px 1000px, 200px 400px, -100px 300px;}
}   
              
            
!

JS

              
                
              
            
!
999px

Console