button.css

/* Project: CSS Glowing Button (Fixed)
*/
body {
  display: flex;
  justify-content: center;
  align-items: center;
  background-color: #161616;
  min-height: 100vh; /* Keeps it centered vertically on the screen */
  overflow: hidden;
}

/* button */
.btn {
  padding: 15px 40px;
  border: none;
  outline: none;
  color: #FFF;
  cursor: pointer;
  position: relative;
  z-index: 1;
  border-radius: 12px;
  background: transparent; /* CRITICAL: Removes default browser background */
}

/* MIDDLE LAYER: Sits right under text */
.btn::after {
  content: "";
  z-index: -1; /* Layer -1 */
  position: absolute;
  width: 100%;
  height: 100%;
  background-color: #333;
  left: 0;
  top: 0;
  border-radius: 12px; /* Matched to parent to fix edge gaps */
}

/* BOTTOM LAYER: The Glow effect */
.btn::before {
  content: "";
  background: linear-gradient(
    45deg,
    #FF0000, #FF7300, #FFFB00, #48FF00,
    #00FFD5, #002BFF, #FF00C8, #FF0000
  );
  position: absolute;
  top: -2px;
  left: -2px;
  background-size: 600%;
  z-index: -2; /* CRITICAL: Dropped to -2 so it sits BEHIND the dark background */
  width: calc(100% + 4px);
  height: calc(100% + 4px); /* Fixed syntax spacing */
  filter: blur(8px);
  animation: glowing 20s linear infinite;
  transition: opacity .3s , filter .2s;
  border-radius: 14px; /* Increased slightly to match outward stretch */
  opacity: 0;
}

@keyframes glowing {
  0% {background-position: 0 0;}
  50% {background-position: 400% 0;}
  100% {background-position: 0 0;}
}

/* hover */
.btn:hover::before {
  opacity: 1;
  filter:blur(8px);
}

.btn:active::before {
  opacity:1;
  filter:blur(0px);
}

/* Optional: Active click states from your tutorial code */
.btn:active::after {
  background: transparent;
}

.btn:active {
  color: #000;
  transform: scale(0.97);
}