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

.zoom-motion(@className, @keyframeName) {
  .make-motion(@className, @keyframeName);
  .@{className}-enter {
    opacity: 0;
    transform: scale(0, 0); // need this by yiminghe
    animation-timing-function: @ease-out-circ;
  }
  .@{className}-leave {
    animation-timing-function: @ease-in-circ;
  }
}

.zoom-motion(zoom, zoom);
.zoom-motion(zoom-up, zoomUp);
.zoom-motion(zoom-down, zoomDown);
.zoom-motion(zoom-left, zoomLeft);
.zoom-motion(zoom-right, zoomRight);

@keyframes zoomIn {
  0% {
    opacity: 0;
    transform-origin: 50% 50%;
    transform: scale(0, 0);
  }
  100% {
    transform-origin: 50% 50%;
    transform: scale(1, 1);
  }
}

@keyframes zoomOut {
  0% {
    transform-origin: 50% 50%;
    transform: scale(1, 1);
  }
  100% {
    opacity: 0;
    transform-origin: 50% 50%;
    transform: scale(0, 0);
  }
}

@keyframes zoomUpIn {
  0% {
    opacity: 0;
    transform-origin: 50% 0%;
    transform: scale(0, 0);
  }
  100% {
    transform-origin: 50% 0%;
    transform: scale(1, 1);
  }
}

@keyframes zoomUpOut {
  0% {
    transform-origin: 50% 0%;
    transform: scale(1, 1);
  }
  100% {
    opacity: 0;
    transform-origin: 50% 0%;
    transform: scale(0, 0);
  }
}

@keyframes zoomLeftIn {
  0% {
    opacity: 0;
    transform-origin: 0% 50%;
    transform: scale(0, 0);
  }
  100% {
    transform-origin: 0% 50%;
    transform: scale(1, 1);
  }
}

@keyframes zoomLeftOut {
  0% {
    transform-origin: 0% 50%;
    transform: scale(1, 1);
  }
  100% {
    opacity: 0;
    transform-origin: 0% 50%;
    transform: scale(0, 0);
  }
}

@keyframes zoomRightIn {
  0% {
    opacity: 0;
    transform-origin: 100% 50%;
    transform: scale(0, 0);
  }
  100% {
    transform-origin: 100% 50%;
    transform: scale(1, 1);
  }
}

@keyframes zoomRightOut {
  0% {
    transform-origin: 100% 50%;
    transform: scale(1, 1);
  }
  100% {
    opacity: 0;
    transform-origin: 100% 50%;
    transform: scale(0, 0);
  }
}

@keyframes zoomDownIn {
  0% {
    opacity: 0;
    transform-origin: 50% 100%;
    transform: scale(0, 0);
  }
  100% {
    transform-origin: 50% 100%;
    transform: scale(1, 1);
  }
}

@keyframes zoomDownOut {
  0% {
    transform-origin: 50% 100%;
    transform: scale(1, 1);
  }
  100% {
    opacity: 0;
    transform-origin: 50% 100%;
    transform: scale(0, 0);
  }
}