CSS Transition from color to gradient

HTML

<div>
test
</div>

CSS

:root {
  --app: radial-gradient( circle 753.6px at 10% 20%, rgba(248,167,221,1) 0%, rgba(230,192,254,1) 41%, rgba(169,217,243,1) 90% );
--base: #FFFFFF;
}

body {
  background: #DDD;
}

div {
  height: 100px;
  line-height: 100px;
  text-align: center;
  width: 300px;
  background: var(--base);
  transition: all 1s ease;
}
div:hover {
  background: var(--app);
}