pleroma-fe/src/components/rich_content/rich_content.scss

.RichContent {
  font-family: var(--font);

  .mfm {
    display: inline-block;

    &.-scale {
      font-size: calc(var(--emoji-size) / 2);
    }

    &:not(.-scale) {
      --emoji-size: 2em;
    }

    &.-pause {
      animation-play-state: paused;
    }

    &[data-mfm-operator="sparkle"] {
      position: relative;

      &::before,
      &::after {
        content: '✨';
        position: absolute;
        opacity: 0.4;
        z-index: -1;
        animation-name: cheap-sparkle;
        animation-duration: 1s;
        animation-timing-function: ease-in-out;
        animation-iteration-count: infinite;
      }

      &::before {
        left: 0;
        animation-direction: alternate;
      }

      &::after {
        right: 0;
        animation-direction: alternate-reverse;
      }
    }

    .emoji {
      /* Misskey's emoji width knows no bounds */
      /* stylelint-disable-next-line declaration-no-important */
      max-width: unset !important;
    }
  }

  &:hover .mfm {
    animation-play-state: running;
  }

  &.-faint {
    color: var(--text);
    /* stylelint-disable declaration-no-important */
    --text: var(--textFaint) !important;
    --link: var(--linkFaint) !important;
    --funtextGreentext: var(--funtextGreentextFaint) !important;
    --funtextCyantext: var(--funtextCyantextFaint) !important;
    /* stylelint-enable declaration-no-important */

    a {
      color: var(--linkFaint);
    }
  }

  blockquote {
    margin: 0.2em 0 0.2em 0.2em;
    font-style: italic;
    border-left: 0.2em solid var(--textFaint);
    padding-left: 1em;
  }

  pre {
    overflow: auto;
  }

  code,
  samp,
  kbd,
  var,
  pre {
    font-family: var(--monoFont);
  }

  p {
    margin: 0 0 1em;
  }

  p:last-child {
    margin: 0;
  }

  h1 {
    font-size: 1.1em;
    line-height: 1.2em;
    margin: 1.4em 0;
  }

  h2 {
    font-size: 1.1em;
    margin: 1em 0;
  }

  h3 {
    font-size: 1em;
    margin: 1.2em 0;
  }

  h4 {
    margin: 1.1em 0;
  }

  .img {
    display: inline-block;

    // fix vertical alignment of stealable emoji
    button {
      display: inline-flex;
    }
  }

  .emoji {
    display: inline-block;
    width: var(--emoji-size, 32px);
    height: var(--emoji-size, 32px);
  }

  &.-allow-non-square-emoji {
    .emoji {
      width: auto;
      max-width: calc(var(--emoji-size, 32px) * 3);
      min-width: var(--emoji-size, 32px);
    }
  }

  .img,
  video {
    max-width: 100%;
    max-height: 400px;
    vertical-align: middle;
    object-fit: contain;
  }

  .greentext {
    color: var(--funtextGreentext);
  }

  .cyantext {
    color: var(--funtextCyantext);
  }
}

a .RichContent {
  /* stylelint-disable-next-line declaration-no-important */
  color: var(--link) !important;
}

@keyframes mfm-spin {
  0% {
    transform: rotate(0deg);
  }

  100% {
    transform: rotate(360deg);
  }
}

@keyframes mfm-spinX {
  0% {
    transform: perspective(8em) rotateX(0);
  }

  100% {
    transform: perspective(8em) rotateX(360deg);
  }
}

@keyframes mfm-spinY {
  0% {
    transform: perspective(8em) rotateY(0);
  }

  100% {
    transform: perspective(8em) rotateY(360deg);
  }
}

@keyframes mfm-jump {
  0% {
    transform: translateY(0);
  }

  25% {
    transform: translateY(-1em);
  }

  50% {
    transform: translateY(0);
  }

  75% {
    transform: translateY(-0.5em);
  }

  100% {
    transform: translateY(0);
  }
}

@keyframes mfm-bounce {
  0% {
    transform: translateY(0) scale(1);
  }

  25% {
    transform: translateY(-16px) scale(1);
  }

  50% {
    transform: translateY(0) scale(1);
  }

  75% {
    transform: translateY(0) scale(1.5,.75);
  }

  100% {
    transform: translateY(0) scale(1);
  }
}

@keyframes mfm-twitch {
  0% {
    transform: translate(7px, -2px);
  }

  5% {
    transform: translate(-3px, 1px);
  }

  10% {
    transform: translate(-7px, -1px);
  }

  15% {
    transform: translateY(-1px);
  }

  20% {
    transform: translate(-8px, 6px);
  }

  25% {
    transform: translate(-4px, -3px);
  }

  30% {
    transform: translate(-4px, -6px);
  }

  35% {
    transform: translate(-8px, -8px);
  }

  40% {
    transform: translate(4px, 6px);
  }

  45% {
    transform: translate(-3px, 1px);
  }

  50% {
    transform: translate(2px, -10px);
  }

  55% {
    transform: translate(-7px);
  }

  60% {
    transform: translate(-2px, 4px);
  }

  65% {
    transform: translate(3px, -8px);
  }

  70% {
    transform: translate(6px, 7px);
  }

  75% {
    transform: translate(-7px, -2px);
  }

  80% {
    transform: translate(-7px, -8px);
  }

  85% {
    transform: translate(9px, 3px);
  }

  90% {
    transform: translate(-3px, -2px);
  }

  95% {
    transform: translate(-10px, 2px);
  }

  100% {
    transform: translate(-2px, -6px);
  }
}

@keyframes mfm-shake {
  0% {
    transform: translate(-3px, -1px) rotate(-8deg);
  }

  5% {
    transform: translateY(-1px) rotate(-10deg);
  }

  10% {
    transform: translate(1px, -3px) rotate(0);
  }

  15% {
    transform: translate(1px, 1px) rotate(11deg);
  }

  20% {
    transform: translate(-2px, 1px) rotate(1deg);
  }

  25% {
    transform: translate(-1px, -2px) rotate(-2deg);
  }

  30% {
    transform: translate(-1px, 2px) rotate(-3deg);
  }

  35% {
    transform: translate(2px, 1px) rotate(6deg);
  }

  40% {
    transform: translate(-2px, -3px) rotate(-9deg);
  }

  45% {
    transform: translateY(-1px) rotate(-12deg);
  }

  50% {
    transform: translate(1px, 2px) rotate(10deg);
  }

  55% {
    transform: translateY(-3px) rotate(8deg);
  }

  60% {
    transform: translate(1px, -1px) rotate(8deg);
  }

  65% {
    transform: translateY(-1px) rotate(-7deg);
  }

  70% {
    transform: translate(-1px, -3px) rotate(6deg);
  }

  75% {
    transform: translateY(-2px) rotate(4deg);
  }

  80% {
    transform: translate(-2px, -1px) rotate(3deg);
  }

  85% {
    transform: translate(1px, -3px) rotate(-10deg);
  }

  90% {
    transform: translate(1px) rotate(3deg);
  }

  95% {
    transform: translate(-2px) rotate(-3deg);
  }

  100% {
    transform: translate(2px, 1px) rotate(2deg);
  }
}

@keyframes mfm-rubberBand {
  0% {
    transform: scale(1);
  }

  30% {
    transform: scale(1.25, .75);
  }

  40% {
    transform: scale(.75, 1.25);
  }

  50% {
    transform: scale(1.15, .85);
  }

  65% {
    transform: scale(.95, 1.05);
  }

  75% {
    transform: scale(1.05, .95);
  }

  100% {
    transform: scale(1);
  }
}

@keyframes mfm-rainbow {
  0% {
    filter: hue-rotate() contrast(150%) saturate(150%);
  }

  100% {
    filter: hue-rotate(360deg) contrast(150%) saturate(150%);
  }
}

@keyframes cheap-sparkle {
  0% {
    filter: hue-rotate() contrast(150%) saturate(150%);
    transform: translateY(-0.5em);
  }

  100% {
    filter: hue-rotate(360deg) contrast(150%) saturate(150%);
    transform: translateY(0.5em);
  }
}