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);
  }
}