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HTML 

              
                <p>Mueva la rueda del rat&oacute;n</p>
<svg width="245" height="245" viewBox="0 0 245 245">
    <defs>
   <linearGradient id="grd" x1="100%" y1="0%" x2="100%" y2="100%"> 
        <stop offset="0%" stop-color="hsl(31,43%,70%)"/>
        <stop offset="100%" stop-color="hsl(31,90%,30%)"/>
   </linearGradient>
 </defs>
  <path class="coffee" fill="hsla(31,43%,60%,0)" d="M47.265 155.576c23.197 11.046 58.908 12.15 75.11 12.887s52.4-6.697 56.082-7.065c0 0-26.99 56.68-58.656 56.975-57.805.537-72.535-62.797-72.535-62.797z"/>
  <g stroke="url(#grd)">
    <path id ="cup" stroke-width = "2" d="M115.173 153.698c-7.624 0-16.477 1.23-5.41 1.476s25.576.738 17.46-1.476-33.692-4.428-34.43-.984 23.662 5.165 36.793 3.936 25.992.07 25.428-3.936c-.49-3.486-26.315-5.41-45.744-5.164-12.598.16-48.694 2.46-49.678 4.92s38.12 5.9 47.22 6.393 73.533-.492 77.22-5.902-32.708-10.82-72.057-11.31c-39.35-.493-68.37 5.41-70.582 7.377s14.71 75.01 72.303 75.01c29.11 0 47.218-22.134 55.088-34.923s16.23-29.02 25.33-30.987 8.362 4.918 8.608 8.36-2.46 32.956-14.264 32.464-11.56-7.13-11.56-7.13"/>
    <path id="plate" stroke-width = "3" d="M50 218.132s-6.885-.737-6.885 3.197 19.674 14.755 62.466 13.28 73.534-8.362 77.715-15.003"/>
    <g id="steam" stroke-width = "1">
    <path id="steam_right" d="M105.09 136.975s11.66-10.083 11.118-24.593-23.906-15.248-23.906-19.43 21.64-17.214 27.79-26.56 1.563-29.512 1.52-37.38 1.685-8.608 1.685-8.608"/>
    <path id="steam_left" d="M100.09 125.768s11.66-10.083 11.118-24.593c-.543-14.51-23.906-15.248-23.906-19.428s21.64-17.215 27.79-26.56 1.563-29.513 1.52-37.382 1.685-8.607 1.685-8.607"/>
    </g>
  </g>
</svg>
!

CSS 

              
                svg {
  border: 1px solid #d9d9d9;
  display: block;
  margin: 0 auto;
  fill: none;
}

.coffee {
  stroke-width: 0;
}

p {
  text-align: center;
  color:hsl(31,43%,40%);
  font-family: Verdana, Geneva, sans-serif;
}
!

JS 

              
                var svg = document.querySelector("svg");
var coffee = document.querySelector("svg .coffee");
var l = 800;
var dasharray = l;
var dashoffset = l;
svg.style.strokeDasharray = dasharray;
svg.style.strokeDashoffset = dashoffset;

document.addEventListener("wheel",

  function(e) {

    e.preventDefault();
    if (dashoffset > 0 && e.deltaY > 0 || 
        dashoffset < l && e.deltaY < 0) {
        dashoffset -= e.deltaY;
    }
   if(dashoffset < 0)dashoffset = 0;
   if(dashoffset > l)dashoffset = l;
    
    svg.style.strokeDashoffset = dashoffset;
    var alpha = map(dashoffset, 0, l, .5, 0);
    coffee.style.fill = "hsla(31,43%,60%,"+alpha+")"
  }, false);

function map(n, a, b, _a, _b) {
  var d = b - a;
  var _d = _b - _a;
  var u = _d / d;
  return _a + n * u;
}
!
999px

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