* {
  padding: 0;
  margin: 0;
  box-sizing: border-box;
}

.container {
  width: 100%;
  height: 100vh;
  background: #232323;
  display: flex;
  justify-content: center;
  align-items: center;
  color: #484848;
}

.container ul {
  list-style: none;
  display: flex;
}

.container ul li {
  font-size: 12rem;
  font-family: Arial, Helvetica, sans-serif;
  text-transform: uppercase;
  letter-spacing: 10px;
  animation: animate 1.4s linear infinite;
}

@keyframes animate {
  0% {
    color: #484848;
    text-shadow: none;
  }
  90% {
    color: #484848;
    text-shadow: none;
  }
  100% {
    color: #fff900;
    text-shadow: 0 0 7px #fff900, 0 0 50px #ff6c00;
  }
}

.container ul li:nth-child(1) {
  animation-delay: .2s;
}

.container ul li:nth-child(2) {
  animation-delay: .4s;
}

.container ul li:nth-child(3) {
  animation-delay: .6s;
}

.container ul li:nth-child(4) {
  animation-delay: .8s;
}

.container ul li:nth-child(5) {
  animation-delay: 1s;
}

.container ul li:nth-child(6) {
  animation-delay: 1.2s;
}

.container ul li:nth-child(7) {
  animation-delay: 1.4s;
}