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HTML

              
                .game-loader
  //- .game-loader__background
  .game-loader__planet
    .loader-radius1
    .loader-radius2
    .loader-radius3
    .loader-radius4
    .loader-mini1
    .loader-mini2
    .loader-mini3
    .loader-mini4
    svg(xmlns='http://www.w3.org/2000/svg', version='1.1')
      defs
        filter#goo
          fegaussianblur(in='SourceGraphic', stddeviation='15', result='blur')
          fecolormatrix(in='blur', mode='matrix', values='1 0 0 0 0  0 1 0 0 0  0 0 1 0 0  0 0 0 26 -7', result='goo')
          feblend(in='SourceGraphic', in2='goo')
          
<!-- button.game-loader__btn.btn-play OMG! It works -->
              
            
!

CSS

              
                $intro-dark-color: #273355;
$intro-light-color: #11DBD9;
$angle: 5deg;

$color1:#FF217B;
$color2:#FF7878;
$color3:#FFA283;
$color4:#962A4E;
$color5:#13C2D3;


$iteration: 1;
$goocolor: #11DBD9;
$orbitcolor: grey;
$bigsize:8vw;
$smallsize:3vw;
$containerwidth:100vw;
$animoffset1:15vw;
$animoffset2:25vw;
$animoffset3:35vw;
$animoffset4:45vw;
$animtime:8s;
$containerheight:100vw;
$radius1: $smallsize*2;
$radius2: $smallsize*3;
$radius3: $smallsize*4;
$radius4: $smallsize*5;

.game-loader {
  width:100vw;
  height:100vh;
  position: fixed;
  top:0;
  left:0;
  z-index: 10000;
	display: flex;
	align-items: center;
	justify-content: center;
	overflow:hidden;
  background: $intro-dark-color;
}

.game-loader__btn{
  position: fixed;
  outline:none;
  		min-width:$bigsize*2;
		min-height:$bigsize/2;
  bottom:10vh;

  z-index:10001;
  background: transparent;
  border: 2px solid $intro-light-color;
  border-radius:25px;
  color: white;
  cursor: pointer;
  padding:0.5em 1em;
  transition: 1s;
  &:hover{
    background: $intro-light-color;
  }
}

.game-loader__planet{
	filter:url('#goo');
	position:relative;
	width:$containerwidth;
	height:$containerheight;
	&::after { //big goo in middle
		content:'';
		display:block;
		width:$bigsize;
		height:$bigsize;
		border-radius:50%;
		background:$goocolor;
	  box-shadow: $goocolor 0 0 24px 4px;
		margin:0 auto;
		position:absolute;
		top:$containerheight/2 - $bigsize/2;
		left:$containerwidth/2 - $bigsize/2;
		animation:scale $animtime*2 linear infinite, color5 $animtime linear $iteration;
	}
	.loader-mini1 {
		position:absolute;
		width:$smallsize;
		height:$smallsize;
		border-radius:50%;
		// background:darken($goocolor, 10%);
    background:$goocolor;
		top:$containerheight/2 -$smallsize/2;
		left:$containerwidth/2 - $smallsize/2;
		animation:move1 $animtime linear $iteration, color1 $animtime linear $iteration;
	}
  .loader-mini2 {
		position:absolute;
		width:$smallsize*1.2;
		height:$smallsize*1.2;
		border-radius:50%;
		// background:darken($goocolor, 10%);
    background:$goocolor;
		top:$containerheight/2 -$smallsize/2;
		left:$containerwidth/2 - $smallsize/2;
		animation:move2 $animtime+1s linear $iteration, color2 $animtime+1s linear $iteration;
	}
  .loader-mini3 {
		position:absolute;
		width:$smallsize*1.4;
		height:$smallsize*1.4;
		border-radius:50%;
		// background:darken($goocolor, 15%);
    background:$goocolor;
		top:$containerheight/2 -$smallsize/2;
		left:$containerwidth/2 - $smallsize/2;
		animation:move3 $animtime+2s linear $iteration, color3 $animtime+2s linear $iteration;
	}
  .loader-mini4 {
		position:absolute;
		width:$smallsize*1.6;
		height:$smallsize*1.6;
		border-radius:50%;
		// background:darken($goocolor, 20%);
    background:$goocolor;
		top:$containerheight/2 -$smallsize/2;
		left:$containerwidth/2 - $smallsize/2;
		animation:move4 $animtime+3s linear $iteration, color4 $animtime+3s linear $iteration;
	}
  .loader-radius1 {
		position:absolute;
		width:$radius1*2;
		height:$radius1*2;
		border-radius:50%;
		// background:darken($goocolor, 10%);
    border:0.5px solid $goocolor;
    opacity: 0.2;
    background:transparent;
		top:$containerheight/2 - $radius1;
		left:$containerwidth/2 - $radius1;
    transform:scale(0);
		animation: orbit1 $animtime linear $iteration;
	}
  .loader-radius2 {
		position:absolute;
		width:$radius2*2;
		height:$radius2*2;
		border-radius:50%;
		// background:darken($goocolor, 10%);
    border:0.5px solid $goocolor;
    opacity: 0.2;
    background:transparent;
        transform:scale(0);
		top:$containerheight/2 - $radius2;
		left:$containerwidth/2 - $radius2;
		animation: orbit2 $animtime+1s linear $iteration;
	}
  .loader-radius3 {
		position:absolute;
		width:$radius3*2;
		height:$radius3*2;
		border-radius:50%;
		// background:darken($goocolor, 10%);
    border:0.5px solid $goocolor;
    opacity: 0.2;
    background:transparent;
        transform:scale(0);
		top:$containerheight/2 - $radius3;
		left:$containerwidth/2 - $radius3;
		animation: orbit3 $animtime+2s linear $iteration;
	}
  .loader-radius4 {
		position:absolute;
		width:$radius4*2;
		height:$radius4*2;
		border-radius:50%;
		// background:darken($goocolor, 10%);
    border:0.5px solid $goocolor;
    opacity: 0.2;
    background:transparent;
        transform:scale(0);
		top:$containerheight/2 - $radius4;
		left:$containerwidth/2 - $radius4;
		animation: orbit4 $animtime+3s linear $iteration;
	}
}

.game-loader__planet--color{
  .loader-mini1 {
		background:darken($goocolor, 5%);
	}
  .loader-mini2 {
		background:darken($goocolor, 10%);
	}
  .loader-mini3 {
		background:darken($goocolor, 15%);
	}
  .loader-mini4 {
		background:darken($goocolor, 20%);
	}
}

.btn-play{
  left:$containerwidth/2 - ($bigsize+1);
}
@keyframes move1 {
	0% {
    transform: skewX($angle) rotate(0deg) translateY(0em) 
               rotate(0deg) skewX(-$angle) rotate(0deg);
    // background:$goocolor;
  }
  
  10% {
    transform: skewX($angle) rotate(180deg) translateY(-$radius1) 
               rotate(-180deg) skewX(-$angle) rotate(180deg);
  }
  25% {
    transform: skewX($angle) rotate(360deg) translateY(-$radius1*2) 
               rotate(-360deg) skewX(-$angle) rotate(360deg);
  }
  
  50% {
    transform: skewX($angle) rotate(720deg) translateY(-$radius1*2) 
               rotate(720deg) skewX(-$angle) rotate(720deg);
    // background:red;
  }
  
  75% {
    transform: skewX($angle) rotate(1080deg) translateY(-$radius1*2) 
               rotate(-1080deg) skewX(-$angle) rotate(1080deg);
                 }
  90% {
    transform: skewX($angle) rotate(1260deg) translateY(-$radius1) 
               rotate(-1260deg) skewX(-$angle) rotate(1260deg);
  }
  
  
  100% {
    transform: skewX($angle) rotate(1440deg) translateY(0em) 
               rotate(-1440deg) skewX(-$angle) rotate(1440deg);
    // background:$goocolor;
  }
}

@keyframes move2 {
	0% {
    transform: skewX($angle) rotate(0deg) translateY(0em) 
               rotate(0deg) skewX(-$angle) rotate(0deg);
  }
  
  10% {
    transform: skewX($angle) rotate(180deg) translateY(-$radius2) 
               rotate(-180deg) skewX(-$angle) rotate(180deg);
  }
  25% {
    transform: skewX($angle) rotate(360deg) translateY(-$radius2*2) 
               rotate(-360deg) skewX(-$angle) rotate(360deg);
  }
  
  50% {
    transform: skewX($angle) rotate(720deg) translateY(-$radius2*2) 
               rotate(720deg) skewX(-$angle) rotate(720deg);
  }
  
  75% {
    transform: skewX($angle) rotate(1080deg) translateY(-$radius2*2) 
               rotate(-1080deg) skewX(-$angle) rotate(1080deg);
                 }
  90% {
    transform: skewX($angle) rotate(1260deg) translateY(-$radius2) 
               rotate(-1260deg) skewX(-$angle) rotate(1260deg);
  }
  
  
  100% {
    transform: skewX($angle) rotate(1440deg) translateY(0em) 
               rotate(-1440deg) skewX(-$angle) rotate(1440deg);
  }
}

@keyframes move3 {
	0% {
    transform: skewX($angle) rotate(0deg) translateY(0em) 
               rotate(0deg) skewX(-$angle) rotate(0deg);
  }
  
  10% {
    transform: skewX($angle) rotate(180deg) translateY(-$radius3) 
               rotate(-180deg) skewX(-$angle) rotate(180deg);
  }
  25% {
    transform: skewX($angle) rotate(360deg) translateY(-$radius3*2) 
               rotate(-360deg) skewX(-$angle) rotate(360deg);
  }
  
  50% {
    transform: skewX($angle) rotate(720deg) translateY(-$radius3*2) 
               rotate(720deg) skewX(-$angle) rotate(720deg);
  }
  
  75% {
    transform: skewX($angle) rotate(1080deg) translateY(-$radius3*2) 
               rotate(-1080deg) skewX(-$angle) rotate(1080deg);
                 }
  90% {
    transform: skewX($angle) rotate(1260deg) translateY(-$radius3) 
               rotate(-1260deg) skewX(-$angle) rotate(1260deg);
  }
  
  
  100% {
    transform: skewX($angle) rotate(1440deg) translateY(0em) 
               rotate(-1440deg) skewX(-$angle) rotate(1440deg);
  }
}

@keyframes move4 {
	0% {
    transform: skewX($angle) rotate(0deg) translateY(0em) 
               rotate(0deg) skewX(-$angle) rotate(0deg);
  }
  
  10% {
    transform: skewX($angle) rotate(180deg) translateY(-$radius4)
               rotate(-180deg) skewX(-$angle) rotate(180deg);
  }
  25% {
    transform: skewX($angle) rotate(360deg) translateY(-$radius4*2) 
               rotate(-360deg) skewX(-$angle) rotate(360deg);
  }
  
  50% {
    transform: skewX($angle) rotate(720deg) translateY(-$radius4*2) 
               rotate(720deg) skewX(-$angle) rotate(720deg);
  }
  
  75% {
    transform: skewX($angle) rotate(1080deg) translateY(-$radius4*2) 
               rotate(-1080deg) skewX(-$angle) rotate(1080deg);
                 }
  90% {
    transform: skewX($angle) rotate(1260deg) translateY(-$radius4) 
               rotate(-1260deg) skewX(-$angle) rotate(1260deg);
  }
  
  
  100% {
    transform: skewX($angle) rotate(1440deg) translateY(0em) 
               rotate(-1440deg) skewX(-$angle) rotate(1440deg);
  }
}

@keyframes scale {
	0% {
		transform:scale(1.5);
  }
	50% {
		transform:scale(1);
	}
	100% {
		transform:scale(1.5);
	}
}

@keyframes orbit1 {
	0% {
    transform:scale(0);
  }
  
  10% {
    transform:scale(1);
  }
  25% {
    transform:scale(2.2);
  }
  
   35% {
    transform:scale(2.1);
  }
  
  50% {
    transform:scale(2);
  }
  
    65% {
    transform:scale(2.1);
  }
  
  75% {
    transform: scale(2);
  }
  90% {
    transform:scale(1);
  }
  
  100% {
    transform: scale(0);
  }
}

@keyframes orbit2 {
	0% {
    transform:scale(0);
  }
  
  10% {
    transform:scale(1);
  }
  25% {
    transform:scale(2.2);
  }
  
   35% {
    transform:scale(2.1);
  }
  
  50% {
    transform:scale(2);
  }
  
    65% {
    transform:scale(2.1);
  }
  
  75% {
    transform: scale(2);
  }
  90% {
    transform:scale(1);
  }
  
  100% {
    transform: scale(0);
  }
}

@keyframes orbit3 {
		0% {
    transform:scale(0);
  }
  
  10% {
    transform:scale(1);
  }
  25% {
    transform:scale(2.2);
  }
  
   35% {
    transform:scale(2.1);
  }
  
  50% {
    transform:scale(2);
  }
  
    65% {
    transform:scale(2.1);
  }
  
  75% {
    transform: scale(2);
  }
  90% {
    transform:scale(1);
  }
  
  100% {
    transform: scale(0);
  }
}

@keyframes orbit4 {
		0% {
    transform:scale(0);
  }
  
  10% {
    transform:scale(1);
  }
  25% {
    transform:scale(2.2);
  }
  
   35% {
    transform:scale(2.1);
  }
  
  50% {
    transform:scale(2);
  }
  
    65% {
    transform:scale(2.1);
  }
  
  75% {
    transform: scale(2);
  }
  90% {
    transform:scale(1);
  }
  
  100% {
    transform: scale(0);
  }
}

@keyframes color1 {
	10% {
		background: $goocolor;
	}
	50% {
		background: $color1;
	}
	90% {
		background: $goocolor;
	}
}

@keyframes color2 {
	10% {
		background: $goocolor;
	}
	50% {
		background: $color2;
	}
	90% {
		background: $goocolor;
	}
}

@keyframes color3 {
	10% {
		background: $goocolor;
	}
	50% {
		background: $color3;
	}
	90% {
		background: $goocolor;
	}
}

@keyframes color4 {
	10% {
		background: $goocolor;
	}
	50% {
		background: $color4;
	}
	90% {
		background: $goocolor;
	}
}

@keyframes color5 {
	10% {
		background: $goocolor;
    box-shadow: $goocolor 0 0 24px 4px;
	}
	50% {
		background: $color5;
    box-shadow: $color5 0 0 24px 4px;
	}
	90% {
		background: $goocolor;
     box-shadow: $goocolor 0 0 24px 4px;
	}
}

.game-loader {
  width:100%;
  height:100%;
  position: fixed;
  top:0;
  left:0;
  z-index: 10000;
	display: flex;
	align-items: center;
	justify-content: center;
	overflow:hidden;
}

svg { //Firefox bug fix
	position:absolute;
	z-index:-100;
	pointer-events:none;
}

              
            
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