.btn-lt {
  position: fixed;
  right: 80px;
  top: 30%;
  width: 68px;
  z-index: 15;
}

@media (max-width: 991px) {
  .btn-lt {
    left: 9px;
    top: 10%;
  }
}

.glow-on-hover {
  width: 48px;
  height: 48px;
  border: none;
  outline: none;
  color: #fff;
  font-size: 32px;
  background: #111;
  cursor: pointer;
  position: relative;
  z-index: 0;
  border-radius: 50%;
  margin-bottom: 30px;
}

.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);
  width: calc(100% + 4px);
  height: calc(100% + 4px);
  animation: glowing 20s linear infinite;
  opacity: 0;
  transition: opacity .3s ease-in-out;
  border-radius: 50%;
}

.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: 50%;
}

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

@media (max-width: 540px) {
  .btn-lt.fadeInRight-animation {
    display: none;
  }
}