How to create Warning Sign in my wiki?

Hi guys,

Sorry for always asking this type of questions, but how i can set this type of Warning in my wiki?

Thank you in advance!

In a tiddler tagged $:/tags/Macro include this definition (extracted macro elements from tw-com):

\whitespace trim

\procedure .infoBox(text:"", title, icon:"$:/core/images/info-button", class, iconSize:"1.4rem")
\function _f.tipClass() [[doc-icon-block]] [<class>!is[blank]then<class>] +[join[ ]]
<div class=<<_f.tipClass>>>
	<%if [<title>!is[blank]] %><div>''<<title>>''</div><%endif%>
	<div class="doc-block-icon"><$transclude $tiddler=<<icon>> size=<<iconSize>>/></div>
	<<text>>
</div>
\end

\procedure .warning(_:"", title:"Warning", icon:"$:/core/images/warning", class:"doc-warning", iconSize:"22pt")
<$macrocall $name=".infoBox" text=<<_>> title=<<title>> icon=<<icon>> class=<<class>> iconSize=<<iconSize>>/>
\end



\end

You can customize the style however you like, but this is roughly what’s there at tw-com (tagged $:/tags/Stylesheet):

.doc-icon-block.doc-warning {
	border-left: 4px solid #881122;
 padding-left:2em;
	background: #88112211;
}

Then, when you want to invoke it, invoke it like this:

<<.warning "This API is not yet fully standardized hence this method of saving is somewhat experimental.">>

There are other solutions to this kind of problem. One such solution is @Mohammad’s Shiraz Callouts Subplugin