<svg width="0" height="0" style="position: absolute; z-index: -9999">
  <filter id="outline">
    <feMorphology in="SourceAlpha" result="DILATED1" operator="dilate" radius="5"></feMorphology>
    <feFlood flood-color="rgb(255,255,255)" flood-opacity="0.25" in="DILATED1" result="STROKE"></feFlood>
    <feComposite in="STROKE" in2="DILATED1" operator="in" result="STROKE2"></feComposite>
    
    <feMorphology in="SourceAlpha" result="DILATED2" operator="dilate" radius="3"></feMorphology>
    <feFlood flood-color="rgb(255,0,255)" flood-opacity="0.5" in="DILATED2" result="LIGHT"></feFlood>
    <feComposite in="LIGHT2" in2="DILATED2" operator="in" result="LIGHT2"></feComposite>
    <feGaussianBlur in="LIGHT2" result="LIGHT3" stdDeviation="3" />

    <feMerge>
      <feMergeNode in="STROKE2" />
      <feMergeNode in="LIGHT3" />
      <feMergeNode in="SourceGraphic" />
    </feMerge>
  </filter>
</svg>

<h1>Lorem</h1>

body {
  margin: 0;
  height: 100vh;
  background: url("https://images.unsplash.com/photo-1559624989-7b9303bd9792?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=668&q=80") no-repeat center / cover;
  overflow: hidden;
}

h1 {
  font-size: 100px;
  text-transform: uppercase;
  font-family: sans-serif;
  filter: url(#outline);
  text-align: center;
  color: #fff;
}