.repl-icon
{
  width:  20px;
  height: 18px;
  animation: glowPulse 4s infinite ease-in-out;
}

.repl-icon-large
{
  width:  36px;
  height: 36px;
  animation: glowPulse-large 2s infinite ease-in-out;
}

@keyframes glowPulse
{
    0% { filter: drop-shadow(0 0 2px  #ff1a1a); }
   20% { filter: drop-shadow(0 0 8px #ff4d4d);  }
   80% { filter: drop-shadow(0 0 8px #ff0000);  }
  100% { filter: drop-shadow(0 0 2px  #ff1a1a); }
}

@keyframes glowPulse-large
{
    0% { filter: drop-shadow(0 0 4px  #ff1a1a); }
   50% { filter: drop-shadow(0 0 20px #ff4d4d); }
  100% { filter: drop-shadow(0 0 8px  #ff1a1a); }
}