Radial gradient

radial-gradient.css

div {
  background: none;
  width: 200px;
  height: 200px;
  border-radius: 50%;
  --size: 16px;
  --gradient: radial-gradient(circle at top, #ffb199, #ff0844);
  position: relative;
}

div::before {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  padding: var(--size);
  background: var(--gradient);
  -webkit-mask: linear-gradient(black, black) content-box, linear-gradient(black, black);
          mask: linear-gradient(black, black) content-box, linear-gradient(black, black);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html,
body {
  padding: 0;
  margin: 0;
}

body {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
}