syn region quartoCalloutNote start=":::\s\+{\.callout-note\s*" end=":::$" keepend
syn region quartoCalloutWarning start=":::\s\+{\.callout-warning\s*" end=":::$" keepend
syn region quartoCalloutImportant start=":::\s\+{\.callout-important\s*" end=":::$" keepend
syn region quartoCalloutTip start=":::\s\+{\.callout-tip\s*" end=":::$" keepend
syn region quartoCalloutCaution start=":::\s\+{\.callout-caution\s*" end=":::$" keepend