.blur {
  background-color: rgba(100, 100, 100, 0.4) !important;
  -webkit-backdrop-filter: blur(5px);
  backdrop-filter: blur(5px);
  padding: 20px;
  border-radius: 20px;
  -webkit-box-shadow: inset 0 0 10px rgba(0, 0, 0, 0.6);
}

.glow-on-hover {
  height: 50px;
  border: none;
  outline: none;
  color: #fff;
  background: #111;
  cursor: pointer;
  position: relative;
  z-index: 0;
  border-radius: 10px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.glow-on-hover:before {
  content: '';
  background: linear-gradient(45deg, #ff0000, #ff7300, #fffb00, #48ff00, #00ffd5, #002bff, #7a00ff, #ff00c8, #ff0000);
  position: absolute;
  top: -2px;
  left:-2px;
  background-size: 400%;
  z-index: -1;
  filter: blur(5px);
  -webkit-filter: blur(5px);
  width: calc(100% + 4px);
  height: calc(100% + 4px);
  animation: glowing 20s linear infinite;
  -webkit-animation: glowing 20s linear infinite;
  opacity: 0;
  transition: opacity .3s ease-in-out;
  border-radius: 12px;
  -webkit-transform: translateZ(0);
  transform: translateZ(0);
}

.glow-on-hover:active {
  color: #000
}

.glow-on-hover:active:after {
  background: transparent;
}

.glow-on-hover:hover:before {
  opacity: 1;
}

.glow-on-hover:after {
  z-index: -1;
  content: '';
  position: absolute;
  width: 100%;
  height: 100%;
  background: #111;
  left: 0;
  top: 0;
  border-radius: 10px;
}

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

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