.cl_titrelettre {
    display: inline;
    font-family: Arial;
    font-size: 20px;
    color: #2efec8;
    text-shadow: 6px 6px 6px #000;
    animation: cl_titrelettre 18s infinite;
    opacity: 0;
  }
  .cl_titrelettre:nth-child(1) {
    animation-delay: 0.3s;
  }
  .cl_titrelettre:nth-child(2) {
    animation-delay: 0.6s;
  }
  .cl_titrelettre:nth-child(3) {
    animation-delay: 0.9s;
  }
  .cl_titrelettre:nth-child(4) {
    animation-delay: 1.2s;
  }
  .cl_titrelettre:nth-child(5) {
    animation-delay: 1.5s;
  }
  .cl_titrelettre:nth-child(6) {
    animation-delay: 1.8s;
  }
  .cl_titrelettre:nth-child(7) {
    animation-delay: 2.1s;
  }
  .cl_titrelettre:nth-child(8) {
    animation-delay: 2.4s;
  }
  .cl_titrelettre:nth-child(9) {
    animation-delay: 2.7s;
  }
  .cl_titrelettre:nth-child(10) {
    animation-delay: 3s;
  }
  .cl_titrelettre:nth-child(11) {
    animation-delay: 3.3s;
  }
  .cl_titrelettre:nth-child(12) {
    animation-delay: 3.6s;
  }
  .cl_titrelettre:nth-child(13) {
    animation-delay: 3.9s;
  }
  .cl_titrelettre:nth-child(14) {
    animation-delay: 4.2s;
  }
  .cl_titrelettre:nth-child(15) {
    animation-delay: 4.5s;
  }
  .cl_titrelettre:nth-child(16) {
    animation-delay: 4.8s;
  }
  .cl_titrelettre:nth-child(17) {
    animation-delay: 5.1s;
  }
  .cl_titrelettre:nth-child(18) {
    animation-delay: 5.4s;
  }
  .cl_titrelettre:nth-child(19) {
    animation-delay: 5.8s;
  }
  @keyframes cl_titrelettre {
    0% {
      opacity: 0;
    }
    15% {
      opacity: 0.5;
    }
    30% {
      opacity: 1;
      color: yellow;
    }
    80% {
      opacity: 1;
    }
    85% {
      opacity: 0.5;
    }
    100% {
      opacity: 0;
    }
  }