ant-design/style/core/motion/move.less

.move-motion(@className, @keyframeName) {
  .make-motion(@className, @keyframeName);
  .@{className}-enter, .@{className}-appear {
    opacity: 0;
    animation-timing-function: @ease-out-circ;
  }
  .@{className}-leave {
    animation-timing-function: @ease-in-circ;
  }
}

.move-motion(move-up, moveUp);
.move-motion(move-down, moveDown);
.move-motion(move-left, moveLeft);
.move-motion(move-right, moveRight);

@keyframes moveDownIn {
  0% {
    transform-origin: 0 0;
    transform: translateY(100%);
    opacity: 0;
  }
  100% {
    transform-origin: 0 0;
    transform: translateY(0%);
    opacity: 1;
  }
}

@keyframes moveDownOut {
  0% {
    transform-origin: 0 0;
    transform: translateY(0%);
    opacity: 1;
  }
  100% {
    transform-origin: 0 0;
    transform: translateY(100%);
    opacity: 0;
  }
}

@keyframes moveLeftIn {
  0% {
    transform-origin: 0 0;
    transform: translateX(-100%);
    opacity: 0;
  }
  100% {
    transform-origin: 0 0;
    transform: translateX(0%);
    opacity: 1;
  }
}

@keyframes moveLeftOut {
  0% {
    transform-origin: 0 0;
    transform: translateX(0%);
    opacity: 1;
  }
  100% {
    transform-origin: 0 0;
    transform: translateX(-100%);
    opacity: 0;
  }
}

@keyframes moveRightIn {
  0% {
    opacity: 0;
    transform-origin: 0 0;
    transform: translateX(100%);
  }
  100% {
    opacity: 1;
    transform-origin: 0 0;
    transform: translateX(0%);
  }
}

@keyframes moveRightOut {
  0% {
    transform-origin: 0 0;
    transform: translateX(0%);
    opacity: 1;
  }
  100% {
    transform-origin: 0 0;
    transform: translateX(100%);
    opacity: 0;
  }
}

@keyframes moveUpIn {
  0% {
    transform-origin: 0 0;
    transform: translateY(-100%);
    opacity: 0;
  }
  100% {
    transform-origin: 0 0;
    transform: translateY(0%);
    opacity: 1;
  }
}

@keyframes moveUpOut {
  0% {
    transform-origin: 0 0;
    transform: translateY(0%);
    opacity: 1;
  }
  100% {
    transform-origin: 0 0;
    transform: translateY(-100%);
    opacity: 0;
  }
}