stop

<svg
  width="100%"
  height="100%"
  viewBox="0 0 80 40"
  xmlns="http://www.w3.org/2000/svg">
  <defs>
    <linearGradient id="MyGradient">
      <stop offset="5%" stop-color="#F60" />
      <stop offset="95%" stop-color="#FF6" />
    </linearGradient>
  </defs>

  <!-- Outline the drawing area in black -->
  <rect fill="none" stroke="black" x="0.5" y="0.5" width="79" height="39" />

  <!-- The rectangle is filled using a linear gradient -->
  <rect
    fill="url(#MyGradient)"
    stroke="black"
    stroke-width="1"
    x="10"
    y="10"
    width="60"
    height="20" />
</svg>