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HTML 

              
                <div class="wrapper">
  <p class="text-gradient">Simple Text Gradient Example</p>
   <div class="bar one">
		<p class="text">Black or White Text Colour Change</p>
  </div> 
  <div class="bar two">
		<p class="text">Dynamic Gradient Text Colour Change</p>
  </div> 
  <div class="bar three">
		<p class="text">Percentage Gradient</p>
  </div> 
   <div class="bar four">
		<p class="text">Percentage Gradient Animation</p>
  </div> 
</div>
!

CSS 

              
                /* COLOR VARIABLES
============================================= */
$yellow: #ffec1a;
$orange: #ffa600;
$purple: #23034d;
$black: #000;
$white: #fff;
$grey: #e3e3e3;


/* LAYOUT
============================================= */

.wrapper {
  position: relative;
  overflow: hidden;
  width: 500px;
  margin: 0 auto;
}

.bar {
  border: solid 1px #e3e3e3;
  margin: 40px 30px;
  padding: 8px 0;
  height: 55px;
}

/* TEXT
============================================= */
.text {
  font-size: 22px;
  font-weight: bold;
  margin: 10px 0;
  text-align: center;
}

/* LISTS
============================================= */ 

$lista: ($purple),
        ($orange),
        ($yellow);

$listb: ($orange 0%),
        ($orange 50%),
        ($white 50%),
        ($white 100%);


/* MIXINS
============================================= */

@mixin gradient($direction, $list) { 
  background: $orange;
  background: -webkit-linear-gradient($direction, $list);
 
}


@mixin animation($bg-size, $time) { 
  background-size: $bg-size $bg-size;
  -webkit-animation: AnimationName $time ease infinite;

  @-webkit-keyframes AnimationName {
      0% {background-position:100% 0%}
      100% {background-position:0% 0%}
  }
  
}

/* FUNCTIONS
============================================= */

@function text-color($list){
   $text-list:();
   @each $color, $percentage in $list {   
    @if lightness($color) > 50% {
     $text-list:append($text-list, $black $percentage, comma);    
    } @else {
        $text-list:append($text-list, $white $percentage, comma);
     }        
	}
  @return $text-list;
} 


@function text-color2($list){
   $text-list:();
   @each $color in $list { 
     $text-list:append($text-list, invert($color), comma);    
	}
  @return $text-list;
} 


/* BARS
============================================= */

.text-gradient {
  width: 100%;
  font-size: 22px;
  font-weight: bold;
  text-align: center;
  color: $orange; // Fallback solid text colour for un-supported browsers
  background: -webkit-linear-gradient(left, $black, $orange);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent; 
}

.one {  
 @include gradient(left, $lista);
    .text {
   	@include gradient(left, text-color($lista));
     -webkit-background-clip: text;
     -webkit-text-fill-color: transparent;    
    }
}

.two {  
 @include gradient(left, $lista);
    .text {
   	@include gradient(left, text-color2($lista));
     -webkit-background-clip: text;
     -webkit-text-fill-color: transparent; 
    }
}

.three {  
	 @include gradient(left, $listb);
    .text {
   	@include gradient(left, text-color($listb));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent; 
  }
}

.four {  
 @include gradient(left, $listb);
 @include animation(200% , 10s);
    .text {
   	@include gradient(left, text-color($listb));
     @include animation(200% , 10s);
     -webkit-background-clip: text;
     -webkit-text-fill-color: transparent; 
    }
}
!

JS
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