.line_animation_wrapp {
    position: relative;
}
.line_animation {
    top: 0px;
    left: 50%;
    z-index: -1;
    width: 100%;
    bottom: 0px;
    display: block;
    position: absolute;
    -webkit-transform: translateX(-50%);
    transform: translateX(-50%);
    z-index: 1;
    display: flex;
    align-items: center;
    justify-content: center;
}
.line_animation .line_area {
    width: 100%;
    height: 100%;
    position: relative;
    display: inline-block;
    border-right: 1px solid var(--border-color);
}
.line_animation .line_area:before {
    width: 1px;
    right: -1px;
    content: "";
    height: 60px;
    border-radius: 100%;
    position: absolute;
    background-image: -webkit-gradient(linear, left bottom, left top, from(var(--body-text-color)), to(transparent));
    background-image: linear-gradient(0deg, var(--body-text-color), transparent);
}
.line_animation .line_area:nth-child(odd):before {
    -webkit-animation: line_animation_2 20s ease-out infinite;
    animation: line_animation_2 20s ease-out infinite;
}
.line_animation .line_area:nth-child(even):before {
    -webkit-animation: line_animation 20s ease-out infinite;
    animation: line_animation 20s ease-out infinite;
}

@-webkit-keyframes line_animation {
    0% {
      top: 0px;
      opacity: 1;
    }
    50% {
      top: 50%;
    }
    100% {
      top: 100%;
      opacity: 1;
    }
  }
  @keyframes line_animation {
    0% {
      top: 0px;
      opacity: 1;
    }
    50% {
      top: 50%;
    }
    100% {
      top: 100%;
      opacity: 1;
    }
  }
  @-webkit-keyframes line_animation_2 {
    0% {
      opacity: 1;
      bottom: 0px;
    }
    50% {
      bottom: 50%;
    }
    100% {
      bottom: 100%;
      opacity: 1;
    }
  }
  @keyframes line_animation_2 {
    0% {
      opacity: 1;
      bottom: 0px;
    }
    50% {
      bottom: 50%;
    }
    100% {
      bottom: 100%;
      opacity: 1;
    }
  }