tiptap/packages/core/src/style.css

.ProseMirror {
  position: relative;
}

.ProseMirror {
  word-wrap: break-word;
  white-space: pre-wrap;
  -webkit-font-variant-ligatures: none;
  font-variant-ligatures: none;
}

.ProseMirror pre {
  white-space: pre-wrap;
}

.ProseMirror-gapcursor {
  display: none;
  pointer-events: none;
  position: absolute;
}

.ProseMirror-gapcursor:after {
  content: "";
  display: block;
  position: absolute;
  top: -2px;
  width: 20px;
  border-top: 1px solid black;
  animation: ProseMirror-cursor-blink 1.1s steps(2, start) infinite;
}

@keyframes ProseMirror-cursor-blink {
  to {
    visibility: hidden;
  }
}

.ProseMirror-hideselection *::selection {
  background: transparent;
}

.ProseMirror-hideselection *::-moz-selection {
  background: transparent;
}

.ProseMirror-hideselection * {
  caret-color: transparent;
}

.ProseMirror-focused .ProseMirror-gapcursor {
  display: block;
}