:root {
  --glow-color: hsl(186 100% 69%);
}

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

.glow-btn {
  position: relative;
  width: 100%;
  top: 5%;
  left: 50%;
  -ms-transform: translate(-50%, -50%);
  transform: translate(-50%, -50%);
  color: var(--glow-color);
  border: 0.15em solid var(--glow-color);
  border-radius: 0.45em;
  background: none;
  perspective: 2em;
  font-family: "Raleway", sans-serif;
  font-size: 2em;
  font-weight: 900;
  letter-spacing: 1em;
  -moz-box-shadow: inset 0px 0px 0.5em 0px var(--glow-color), 0px 0px 0.5em 0px var(--glow-color);
  box-shadow: inset 0px 0px 0.5em 0px var(--glow-color), 0px 0px 0.5em 0px var(--glow-color);
  animation: border-flicker 2s linear infinite;
}

.glow-btn::before {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  left: 0;
  right: 0;
  opacity: 0.7;
  filter: blur(1em);
  transform: translateY(120%) rotateX(95deg) scale(1, 0.35);
  background: var(--glow-color);
  pointer-events: none;
}

.glow-btn::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  opacity: 0;
  z-index: -1;
  background-color: var(--glow-color);
  box-shadow: 0 0 2em 0.2em var(--glow-color);
  transition: opacity 100ms linear;
}

.glow-btn:hover {
  color: rgba(0, 0, 0, 0.8);
  text-shadow: none;
  animation: none;
}

.glow-btn:hover .faulty-letter {
  animation: none;
  text-shadow: none;
  opacity: 1;
}

.glow-btn:hover:before {
  filter: blur(1.5em);
  opacity: 1;
}

.glow-btn:hover:after {
  opacity: 1;
}