:root {
  --clr-neon: hsl(317 100% 54%);
  --clr-bg: hsl(323 21% 16%);
}

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

body {
  font-family: "Montserrat", sans-serif;
  text-align: center;
  height: 100vh;
  color: var(--clr-neon);
  display: grid;
  place-content: center;
  place-items: center;
}

canvas {
  //position: relative;
  //top: 50%;
  //left: 50%;
  //margin-left: -50vmin;
  width: 400px;
  height: 400px;
}

.neon-button {
  font-size: 1.5rem;
  display: inline-block;
  cursor: pointer;
  text-decoration: none;
  color: var(--clr-neon);
  padding: 0.25em 1em;

  text-shadow: 0 0 0.125em hsl(0 0% 100% / 0.3), 0 0 0.45em currentColor;

  //box-shadow: inset 0 0 0.5em 0 var(--clr-neon), 0 0 0.5em 0 var(--clr-neon);

  position: relative;
}

.neon-button::before {
  pointer-events: none;
  content: "";
  position: absolute;
  background: var(--clr-neon);
  top: 120%;
  left: 0;
  width: 100%;
  height: 100%;

  transform: perspective(1em) rotateX(40deg) scale(1, 0.35);
  filter: blur(1em);
  opacity: 0.7;
}

.neon-button::after {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  left: 0;
  right: 0;
  box-shadow: 0 0 2em 0.5em var(--clr-neon);
  opacity: 0;
  background-color: var(--clr-neon);
  z-index: -1;
  transition: opacity 100ms linear;
}