The first commented line is your dabblet’s title

dabblet.css

/**
 * The first commented line is your dabblet’s title
 */
#logo {
	display: flex;
	width: 20rem;
	height: 20rem;
	text-align: center;
	background-color: purple;
	justify-content: center;
	align-items: center;
	border-radius: 100%;
	border: 1px solid purple;
	font-size: 8rem;
	font-family: sans-serif;
	color: white;
	font-weight: bold;
	transition: color 0.4s ease, background-color 0.4s ease;
}

#logo:hover {
	content: "▼";
	color: purple;
	background-color: transparent;
	transition: color 0.4s ease, background-color 0.4s ease;
}

dabblet.html

<div id="logo">
	<div>M</div>
</div>

settings.json

{"view":"split","fontsize":"100","seethrough":"","prefixfree":"1","page":"all"}