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HTML

              
                h1 404
	br
	|Not 
	br 
	|Found

              
            
!

CSS

              
                $color1: #EB4A2C;
$color2: #F5ECCF;
$color3: #640E13;
$color4: #FCB043;
$cubic-bezier: cubic-bezier(0.68, -0.55, 0.265, 1.55);

//initial text-shadow function
@function textShadow($color){
	//value variable: x-value, y-value, color value;
	$val: 0px 0px $color;
	//loop to create text-shadow variables moving 1px to the left and 1 down
	@for $i from 1 through 50{
		$val: #{$val}, -#{$i}px #{$i}px #{$color};
	}
	//return value
	@return $val;
}

@function textAnimationShadow($color1, $color2,$color3,$color4,$color5){
	$val1: 0px 0px $color1;
	$val2: 0px 0px $color2;
	$val3: 0px 0px $color3;
	$val4: 0px 0px $color4;
	$val5: 0px 0px $color5;
	@for $i from 1 through 10{
		$val1: #{$val1}, -#{$i}px #{$i}px #{$color1};
	}
	@for $i from 11 through 20{
		$val2: #{$val2}, -#{$i}px #{$i}px #{$color2};
	}
	@for $i from 21 through 30{
		$val3: #{$val3}, -#{$i}px #{$i}px #{$color3};
	}
	@for $i from 31 through 40{
		$val4: #{$val4}, -#{$i}px #{$i}px #{$color4};
	}
	@for $i from 41 through 50{
		$val5: #{$val5}, -#{$i}px #{$i}px #{$color5};
	}
	@return $val1, $val2, $val3, $val4, $val5;
}

//mixin to create initial text-shadow
@mixin shadow($shadow-color){
	text-shadow: textShadow($shadow-color);
}
//mixin to create animation shadow, can enter 5 color variables
@mixin animationShadow($shadow-color1, $shadow-color2,$shadow-color3, $shadow-color4, $shadow-color5){
	text-shadow: textAnimationShadow($shadow-color1, $shadow-color2,$shadow-color3, $shadow-color4, $shadow-color5);
}

body,html{
	height: 100%;
}

body{
	background: $color4;
	display: flex;
	align-items: center;
	align-content: center;
	justify-content: center;
}

h1{
	font-family: 'Shrikhand', cursive;
	text-align: center;
	font-weight: normal;
	font-size: 7rem;
	color: $color2;
	@include shadow($color1);
	animation: color 1.5s ease-in infinite;
}

@keyframes color{
	0%,10%{
		color: $color1;
		@include shadow($color3);
	}
	11%,20%{
		color: $color1;
		@include animationShadow($color3,$color3,$color3,$color3,$color1);
	}
	21%, 30%{
		color: $color1;
		@include animationShadow($color3,$color3,$color3,$color1,$color1);
	}
	31%, 40%{
		color: $color1;
		@include animationShadow($color3,$color3,$color1,$color1,$color1);
	}
	41%, 50%{
		color: $color1;
		@include animationShadow($color3,$color1,$color1,$color1,$color1);
	}
	51%,60%{
		color: $color2;
		@include animationShadow($color1,$color1,$color1,$color1,$color1);
	}
	61%,100%{
		color: $color2;
		@include animationShadow($color1,$color1,$color1,$color1,$color1);
	}
}
              
            
!

JS

              
                // Randomnize letters then name
// paralax down
              
            
!
999px

Console