logseq/src/main/frontend/animations.css

/* make keyframes that tell the start state and the end state of our object */
@-webkit-keyframes fadeIn {
  from {
    opacity: 0;
  }

  to {
    opacity: 1;
  }
}

@-moz-keyframes fadeIn {
  from {
    opacity: 0;
  }

  to {
    opacity: 1;
  }
}

@keyframes fadeIn {
  from {
    opacity: 0;
  }

  to {
    opacity: 1;
  }
}

.fade-in {
  opacity: 0; /* make things invisible upon start */
  animation: fadeIn ease-in 1; /* call our keyframe named fadeIn, use animation ease-in and repeat it only 1 time */
  animation-fill-mode: forwards; /* this makes sure that after animation is done we remain at the last keyframe value (opacity: 1) */
  animation-duration: 0.5s;

  &.faster {
    animation-duration: 0.3s;
  }
}

/* page transition */
.fade-enter {
  opacity: 0;
}

.fade-enter.fade-enter-active {
  opacity: 1;
  transition: opacity 500ms ease-in;
}

.fade-exit {
  opacity: 1;
}

.fade-exit.fade-exit-active {
  opacity: 0;
  transition: opacity 300ms ease-in;
}