@property --angle {
  syntax: "<angle>";
  inherits: true;
  initial-value: 0deg;
}

:root {
  --colors: purple, limegreen, limegreen, purple, purple;
  --border-width: 2px;
  --border: var(--border-width) solid transparent;
  --blur: blur(10px);
  --background: linear-gradient(Canvas 0 0) padding-box,
    conic-gradient(from var(--angle), var(--colors)) border-box;
}

@keyframes spin {
  100% {
    --angle: 360deg;
  }
}

.glow-edge {
  width: 100%;
  max-width: 600px;
  margin-inline: auto;
  gap: 5px;
  padding: 20px;
  border: var(--border-width) solid transparent;
  border-radius: 100vw;
  background: linear-gradient(Canvas 0 0) padding-box,
    conic-gradient(from var(--angle), var(--colors)) border-box;
  position: relative;

  &:hover {
    animation: spin 2s infinite linear;
  }

  &::after {
    content: "";
    position: absolute;
    inset: calc(var(--border-width) * -1);
    border: var(--border);
    border-radius: inherit;
    background: linear-gradient(Canvas 0 0) padding-box,
      conic-gradient(from var(--angle), var(--colors)) border-box;
    filter: var(--blur);
  }
}

.content {
  position: relative;
  display: flex;
  align-items: center;
  flex-direction: column;
  z-index: 1;
}

html {
  box-sizing: border-box;
  color-scheme: dark;
}

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

body {
  padding: 1rem;
  margin: 0;
  display: grid;
  min-height: 100svh;
  place-items: center;
  font-family: -apple-system, BlinkMacSystemFont, avenir next, avenir, segoe ui,
    helvetica neue, Adwaita Sans, Cantarell, Ubuntu, roboto, noto, helvetica,
    arial, sans-serif;
}

h2 {
  margin-block-start: 0.5rem;
  margin-block-end: 0rem;
}