chromium/chrome/browser/resources/lens/overlay/cursor_tooltip.html

<style>
  #cursorTooltip {
    background-color: rgba(var(--color-scrim-rgb), .8);
    border-radius: 8px;
    left: var(--offset-left);
    padding: 6px 12px;
    pointer-events: none;
    position: absolute;
    transform: translateX(-50%);
    transition: opacity 200ms ease-out;
    top: var(--offset-top);
  }

  #cursorTooltipContainer.hidden {
    visibility: hidden;
  }

  .tooltip-text {
    color: var(--color-overlay-button-label);
    font-size: 12px;
    line-height: 20px;
    vertical-align: middle;
  }
</style>
<div id="cursorTooltipContainer"
    class$="[[getHiddenCursorClass(currentTooltip, isPointerInsideViewport,
            canShowTooltipFromPrefs, forceTooltipHidden)]]">
  <div id="cursorTooltip">
    <span class="tooltip-text">[[tooltipMessage]]</span>
  </div>
</div>