:root {
  /*--color-default: #212529;*/
  --color-red: #ce1212;
  /*--color-secondary: #37373f;*/
}

.about .about-img {
  min-height: 500px;
}

.about .play-btn {
  width: 94px;
  height: 94px;
  background: radial-gradient(var(--color-red) 50%, rgba(206, 18, 18, 0.4) 52%);
  border-radius: 50%;
  display: block;
  position: absolute;
  left: calc(50% - 47px);
  top: calc(50% - 47px);
  overflow: hidden;
}

.about .play-btn:before {
  content: "";
  position: absolute;
  width: 120px;
  height: 120px;
  animation-delay: 0s;
  animation: pulsate-btn 2s;
  animation-direction: forwards;
  animation-iteration-count: infinite;
  animation-timing-function: steps;
  opacity: 1;
  border-radius: 50%;
  border: 5px solid rgba(206, 18, 18, 0.7);
  top: -15%;
  left: -15%;
  background: rgba(198, 16, 0, 0);
}

.about .play-btn:after {
  content: "";
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translateX(-40%) translateY(-50%);
  width: 0;
  height: 0;
  border-top: 10px solid transparent;
  border-bottom: 10px solid transparent;
  border-left: 15px solid #fff;
  z-index: 100;
  transition: all 400ms cubic-bezier(0.55, 0.055, 0.675, 0.19);
}

.about .play-btn:hover:before {
  content: "";
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translateX(-40%) translateY(-50%);
  width: 0;
  height: 0;
  border: none;
  border-top: 10px solid transparent;
  border-bottom: 10px solid transparent;
  border-left: 15px solid #fff;
  z-index: 200;
  animation: none;
  border-radius: 0;
}

.about .play-btn:hover:after {
  border-left: 15px solid var(--color-red);
  transform: scale(20);
}

@keyframes pulsate-btn {
  0% {
    transform: scale(0.6, 0.6);
    opacity: 1;
  }

  100% {
    transform: scale(1, 1);
    opacity: 0;
  }
}