This will adjust the paragraph text from the builder, if you’re using custom HTML, you’ll need to write your own CSS. 

[data-wm-plugin="image-hotspots"] {
  --wm-ih-tooltip-title-color: #1a1a1a;
  --wm-ih-tooltip-title-font-size: 16px;
  --wm-ih-tooltip-title-mobile-font-size: 15px;
  --wm-ih-tooltip-title-font-weight: 600;
  --wm-ih-tooltip-title-font-family: inherit;

  --wm-ih-tooltip-description-color: #666666;
  --wm-ih-tooltip-description-font-size: 14px;
  --wm-ih-tooltip-description-font-family: inherit;
  --wm-ih-tooltip-description-line-height: 1.5;
}
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Tooltip Container