textRevealer.css

html { box-sizing: border-box; }
*, *::before, *::after { box-sizing: inherit; }

body {
  width: 100vw;
  height: 100vh;
  margin: 0;
  padding: 0;
  overflow: hidden;
}

#textContainer {
  width: 100%;
  height: 100%;
  display: flex;
  justify-content: center;
  align-items: center;
  text-align: center;
  overflow: hidden;
}
.v-rl {
  writing-mode: vertical-rl;
}

#textRevealer {
  padding: 5vmin 5vmin;
  font-size: 70vmin;
  font-family: Roboto, "Noto Sans CJK TC", sans-serif;
  text-rendering: optimizeLegibility;
  white-space: pre;
}

#textArea {
  position: absolute;
  opacity: 0;
  pointer-events: none;
  font-family: Roboto, "Noto Sans CJK TC", sans-serif;
  text-align: center;
  white-space: nowrap;
}

@keyframes blink {
  from { background-color: rgba(0, 0, 0, .8); }
  to { background-color: rgba(0, 0, 0, 0); }
}

.tag { display: inline-block; }
.tag[data-content="\\n"] { display: inline; }
#textRevealer::before, #textRevealer::after,
.tag[data-content="\\n"]::before, .tag[data-content="\\n"]::after {
  content: "";
  padding: 1px;
}

.tag.-CURSOR {
  position: relative;
  margin: 0 -2px;
}
  .tag.-CURSOR::before {
    content: '';
    padding: 0 2px;
    animation: blink 600ms ease-in-out infinite alternate both;
  }
.tag.-SELECT {
  background-color: rgba(0, 0, 0, .5);
  color: rgba(255, 255, 255, .9);
}

.tag.-SYMBOL { opacity: .5; }

.tag.-numsign, .tag.-numsign-start {
  font-size: 2em;
  font-weight: 900;
}
.tag.-numsign2, .tag.-numsign2-start {
  font-size: 1.5em;
  font-weight: 700;
}

.tag.-at, .tag.-at-start { color: #2196f3; }

.tag.-caret, .tag.-caret-start {
  font-size: 0.6em;
  transform: translateY(-0.6em);
}
  .tag.-caret.-numsign, .tag.-caret-start.-numsign { font-size: 1.2em; }
  .tag.-caret.-numsign2, .tag.-caret-start.-numsign2 { font-size: 0.9em; }

.tag.-ast, .tag.-ast3 { font-style: italic; }
.tag.-ast2, .tag.-ast3 { font-weight: bold; }

.tag.-under { text-decoration: underline; }
.tag.-hyphen { text-decoration: line-through; }
.tag.-tilde { text-decoration: line-through; }

.tag.-dblq, .tag.-dblq-start, .tag.-dblq-end,
.tag.-cjkq, .tag.-cjkq-start, .tag.-cjkq-end,
.tag.-cjkdq, .tag.-cjkdq-start, .tag.-cjkdq-end {
  font-family: serif;
}

.tag.-grave, .tag.-grave-start, .tag.-grave-end {
  font-family: monospace;
  font-size: inherit;
  font-style: normal;
  font-weight: normal;
  text-decoration: none;
  transform: none;
  background-color: rgba(253, 197, 101, .2);
}
  .tag.-grave.-SELECT, .tag.-grave-start.-SELECT, .tag.-grave-end.-SELECT {
    background-color: rgba(246, 183, 99, .5);
    color: #61574c;
  }