.mybtn-container {
  --sz: clamp(16px, 22px, 24px);
  --rotate-hour: 0;

  display: flex;
  justify-content: center;
  align-items: center;
  height: 500px; /* no vh */
  width: 500px; /* no vw */

  position: relative;
  background: #1e1e1e;
  font-family: sans-serif;
  overflow: hidden;
}

/* Localized noise overlay */
.mybtn-container::after {
  content: "";
  z-index: 100;
  width: 100%;
  height: 100%;
  position: absolute;
  top: 0;
  left: 0;
  pointer-events: none;
  background: radial-gradient(circle at 50% 50%, #000, #0000),
    url("data:image/svg+xml,%3Csvg viewBox='0 0 600 600' xmlns='://www.w3.org/2000/svg'%3E%3Cfilter id='noiseFilter'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='2' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noiseFilter)'/%3E%3C/svg%3E");
  filter: contrast(100%) brightness(200%) invert(1) grayscale(1) opacity(0.1);
  mix-blend-mode: screen;
}

/* BUTTON */
.mybtn-button {
  display: block;
  width: fit-content;
  height: fit-content;
  position: relative;
  margin: auto;
  background: linear-gradient(#ccc, #1e1e1e);
  box-shadow:
    inset 0 0 0.1em 0 #ccc,
    0 0.3em 0.1em -0.2em #aaa,
    0 0.3em 0 0 #333,
    0 0.4em 0 0.1em #0004,
    -0.4em 0.4em 0.2em 0 #000a;
  border-radius: 0.2em;
  text-decoration: none;
  color: #1e1e1e;
  font-weight: 1000;
  text-shadow:
    0 -2px 1px #0004,
    0 2px 1px #fff4;
  padding: 0.4em 1em;
  transition: all 0.2s ease;
  cursor: pointer;
  --x: 0%;
}

.mybtn-button span {
  user-select: none;
}

.mybtn-button::before {
  content: "";
  display: block;
  position: absolute;
  left: 0;
  right: 0;
  top: 0;
  bottom: 0;
  margin: auto;
  width: 0;
  height: 100%;
  background: linear-gradient(
    90deg,
    #fff0 0%,
    #fff4 30%,
    #fff6 40%,
    #fff0 100%
  );
  transform: skewX(-32deg);
  translate: 2em;
  transition: all 0.2s ease;
}

.mybtn-button:hover {
  translate: 0 0.3em;
  color: #fff;
  text-shadow: 0 0 5px #fff;
  box-shadow:
    inset 0 0 0.1em 0 #ccc,
    0 0em 0.1em -0.2em #aaa,
    0 0em 0 0 #333,
    0 0.1em 0 0.1em #0004,
    -0.1em 0 0.2em 0 #000a;
  background: linear-gradient(
    -182deg,
    #fff 0%,
    #aaa 16%,
    #555 36%,
    #777 70%,
    #555 84%
  );
}

.mybtn-button:hover::before {
  width: 2em;
  transform: skewX(0deg);
  translate: -3em;
  opacity: 0;
}

.mybtn-button:hover .mybtn-shimmer {
  opacity: 1;
}

/* SHIMMER */
.mybtn-shimmer {
  position: absolute;
  left: 0;
  right: 0;
  top: 12%;
  z-index: 3;
  margin: auto;
  transition:
    all 0.2s ease,
    translate 0.8s ease-out;
  --shimmer-size: 3em;
  --shimmer-clr: #fffde7;
  opacity: 0;
  pointer-events: none;
  translate: var(--x);
}

.mybtn-shimmer > div,
.mybtn-shimmer > div::before {
  position: absolute;
  left: 0;
  right: 0;
  top: 0;
  bottom: 0;
  margin: auto;
  z-index: 100;
}

.mybtn-shimmer > div {
  --ani-speed: 8s;
  width: calc(2 * var(--shimmer-size));
  height: calc(2 * var(--shimmer-size));
  animation: flicker-spin var(--ani-speed) linear infinite;
}

.mybtn-shimmer > div:nth-child(2) {
  animation-delay: calc(-1 * var(--ani-speed) / 3);
}
.mybtn-shimmer > div:nth-child(3) {
  animation-delay: calc(-2 * var(--ani-speed) / 3);
}

.mybtn-shimmer > div::before {
  content: "";
  width: calc(var(--shimmer-size) / 4);
  height: calc(var(--shimmer-size) / 4);
  background: var(--shimmer-clr);
  filter: blur(4px);
  animation: flicker-spin calc(var(--ani-speed) / 2) linear reverse infinite;
}

/* KEYFRAMES */
@keyframes flicker-spin {
  0% {
    border-image: radial-gradient(var(--shimmer-clr) 69%, #0000 70%) 2%/45%;
    rotate: 0deg;
  }
  50% {
    border-image: radial-gradient(var(--shimmer-clr) 69%, #0000 70%) 0%/42%;
  }
  100% {
    border-image: radial-gradient(var(--shimmer-clr) 69%, #0000 70%) 2%/45%;
    rotate: 360deg;
  }
}