body{
  transition: background-color 1s;
}


  .headInnerText {
    animation-name: headTHc;
    animation-duration: 0.5s;
    float: left;
    margin-bottom: 3px;
    animation-fill-mode: both;
    transition: all 0.5s cubic-bezier(0.785, 0.135, 0.15, 0.86);
  }
  
  .headAnother {
    animation-name: headHc;
    animation-duration: 0.5s;
    animation-fill-mode: both;
    transition: all 1.6s cubic-bezier(0.785, 0.135, 0.15, 0.86);
  }
  
  .header {
    min-height: 100vh;
    background-color: black;
  }
  
  .headIMG {
    z-index: -100;
    justify-content: center;
    width: auto;
  }
  
  .img {
    opacity: 0.5;
    filter: blur(5px);
    object-fit: cover;
    position: absolute;
    /*-webkit-filter: grayscale(100%);*/
    top: 50px;
    height: 100vh;
    width: 100%;
  }
  
  .headerHTML {
    overflow: hidden;
    z-index: 10;
  }
  
  .declaration {
    min-height: 100vh;
    background-color: black;
    z-index: 10;
  }
  .declarationImg {
    height: 100vh;
    background-color: black;
    background-image: url("https://www.arsrna.cn/joinus/images/declaration.png");
    background-position: center center;
    background-size: 100%;
    background-repeat: no-repeat;
    position: sticky;
    top: 0;
    z-index: -1;
  }
  
  #declarationInner {
    padding-top: 5%;
  }
  
  @keyframes headTHc {
    0% {
      opacity: 0;
      transform: translateY(40%);
    }
    100% {
      opacity: 1;
      transform: translateY(0%);
    }
  }
  
  @keyframes headHc {
    0% {
      opacity: 0;
      transform: translateY(40%);
    }
    100% {
      opacity: 1;
      transform: translateY(0%);
    }
  }
  
  .delighter.textHCLeft {
    animation-duration: 0.4s;
    transition: all 0.6s cubic-bezier(0.77, 0, 0.175, 1);
    transform: translateY(30%);
    opacity: 0;
  }
  
  .delighter.textHCLeft.started {
    animation-duration: 0.4s;
    transition: all 0.6s cubic-bezier(0.77, 0, 0.175, 1);
    transform: translateY(0%);
    opacity: 1;
  }
  
  .title {
    font-size: 4rem;
  }
  
  .para {
    font-size: 2rem;
    padding-left: 5vh;
    padding-right: 5vh;
  }
  
  .hdpic {
    overflow: hidden;
    object-fit: cover;
    width: 100%;
    z-index: -1;
    position: absolute;
    filter:brightness(30%);
    height: 60vh;
  }
  
  
  .headDescription {
    font-size: 2.5rem;
    overflow: hidden;
    transition: all 600ms cubic-bezier(0.86, 0, 0.07, 1);
    background: linear-gradient(0.25turn, #ff00cc, #89fffd);
    background-clip: text;
    -webkit-background-clip: text;
    color: transparent;
    font-weight: 200;
  }
  
  .headText {
    z-index: 20;
    position: relative;
    padding-top: 10vh;
    transition: all 600ms cubic-bezier(0.86, 0, 0.07, 1);
    padding-left: 5vh;
    padding-right: 5vh;
  }
  
  .img-50 {
    width: 80px;
    height: auto;
  }
  
  .ar-tit {
    font-size: 5.5vw;
    font-weight: 200;
  }
  
  .ar-dec {
    font-size: 1.5rem;
    font-weight: 200;
  }
  
  .d-card-img {
    filter: blur(2px);
    opacity: 0.5;
    height: 250px;
    object-fit: cover;
    justify-content: center;
    transition: all 0.5s cubic-bezier(0.785, 0.135, 0.15, 0.86);
  }
  
  .description {
    font-size: 10vw;
  }
  
  .sap {
    font-size: 5vw;
    font-style: italic;
    font-weight: 100;
    text-align: center;
    position: sticky;
    top: 0px;
    z-index: 20;
    background-color: rgba(0, 0, 0, 0.7);
    width: 100%;
  }
  
  .display-none {
    display: none;
  }

  #hdpicplayer{
      position: sticky;
      z-index: -1;
      top: 0px;
      object-fit: cover;
      height: 100vh;
      opacity: 0.4;
  }

  .headText{
      z-index: 1;
      position: absolute;
      height: 100vh;
  }