html, body{
  overflow: hidden;
  position: relative;
}
.intro_black{
  position: absolute;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  background: #000;
  animation-name: cover;
  animation-duration: 3s;
  animation-delay: 2s;
  animation-timing-function: ease-in-out; 
  animation-fill-mode: backwards; 
  opacity: 0;
}
@keyframes cover{
  0%{
    opacity: 1;
  }
  100%{
    opacity: 0;
  }
}

.video_main{
  width: 100% !important;
  height: 100vh !important;
  object-fit: cover;
}

.intro_txt{
  position: absolute;
  left: 50%;
  top: 40%;
  transform: translate3d(-50%, -50%, 0);
  text-align: center;
  color: #FFF;
}
.intro_title{
  font-family: 'Alfa Slab One', cursive;
  font-size: 150px;
  line-height: 50px;
  margin: 0 0 50px 0;
  animation-name: title;
  animation-duration: 2s;
  animation-delay: 0s;
  animation-timing-function: ease-in-out; 
  animation-fill-mode: backwards; 
  opacity: 1;
  transform: scale(1);
  color: #000;
}
@media (max-width: 575px){
  .intro_title{
    font-size: 80px;
    line-height: 70px;
  }
}
.intro_title > p{
  letter-spacing: 0px;
}
@keyframes title{
  0%{
    opacity: 0;
    transform: scale(1.1);
  }
  100%{
    opacity: 1;
    transform: scale(1);
  }
}

.intro_subTitle{
  height: 44px;
  margin: 30px 0;
  line-height: 24px;
  text-align: center;
  animation-name: subTitle;
  animation-duration: 0.2s;
  animation-delay: 2s;
  animation-timing-function: ease-in-out; 
  animation-fill-mode: backwards; 
  opacity: 1;
  transform: translateY(0px);
}
.enter_effect{
  padding-top: 10px;
  font-size: 40px;
  letter-spacing: 1px;
  text-align: center;
  color: #000;
}
.enter_effect:hover{
  color: #000;
}
.enter_effect, .enter_effect > span{
  position: relative;
  color: inherit;
  text-decoration: none;
  line-height: 24px;
}
.enter_effect:before, .enter_effect:after, .enter_effect > span:before,.enter_effect > span:after{
  content: "";
  position: absolute;
  transition: transform 0.5s ease;
}
.enter_effect:before{
  left: 0;
  bottom: 0;
  width: 100%;
  height: 2px;
  background: #FFF;
  transform: scaleX(0);
}
.enter_effect:hover:before{
  transform: scaleX(1);
}
@keyframes subTitle{
  0%{
    opacity: 0;
    transform: translateY(30px);
  }
  100%{
    opacity: 1;
    transform: translateY(0px);
  }
}