.signal {
    border: 3px solid #3a3732;
    border-radius: 30px;
    height: 30px;
    left: 50%;
    margin: -15px 0 0 -15px;
    opacity: 0;
    position: absolute;
    top: 50%;
    width: 30px;
    animation: pulsate 2s ease-out;
    animation-iteration-count: infinite;
}
.signal1 {
    border: 2px solid #DE7C00;
    border-radius: 40px;
    height: 40px;
    left: 50%;
    margin: -10px 0 0 -10px;
    opacity: 0;
    position: absolute;
    top: 50%;
    width: 40px;
    animation: pulsate 1.3s ease-out;
    animation-iteration-count: infinite;
}
.signal2 {
    border: 2px solid #ff0000;
    border-radius: 40px;
    height: 40px;
    left: 48%;
    margin: -10px 0 0 -10px;
    opacity: 0;
    position: absolute;
    top: 49%;
    width: 40px;
    animation: pulsate2 1.7s ease-out;
    animation-iteration-count: infinite;
}

@keyframes pulsate {
    0% {
      transform: scale(.1);
      opacity: 0.0;
    }
    70% {
      opacity: 1;
    }
    100% {
      transform: scale(1.4);
      opacity: 0;
    }
}
@keyframes pulsate2 {
    0% {
      transform: scale(.1);
      opacity: 0.0;
    }
    40% {
      transform: scale(.1);
      opacity: 0.0;
    }
    70% {
      opacity: 1;
    }
    100% {
      transform: scale(1.4);
      opacity: 0;
    }
}