Circle Gradient
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<meta charset="utf-8">
<body>
<svg width="960" height="500">
<defs>
<radialGradient id="gradient" cx="50%" cy="50%" r="50%" fx="50%" fy="50%">
<stop offset="0.0%" stop-color="#2c7bb6"></stop>
<stop offset="12.5%" stop-color="#00a6ca"></stop>
<stop offset="25.0%" stop-color="#00ccbc"></stop>
<stop offset="37.5%" stop-color="#90eb9d"></stop>
<stop offset="50.0%" stop-color="#ffff8c"></stop>
<stop offset="62.5%" stop-color="#f9d057"></stop>
<stop offset="75.0%" stop-color="#f29e2e"></stop>
<stop offset="87.5%" stop-color="#e76818"></stop>
<stop offset="100.0%" stop-color="#d7191c"></stop>
</radialGradient>
</defs>
<circle cx="200" cy="140" r="85" fill="url(#gradient)" />
</svg>
</body>