dwdoc/node_modules/prismjs/plugins/show-language/prism-show-language.css

pre[class*='language-'] {
	position: relative;
}
pre[class*='language-'][data-language]::before {
	content: attr(data-language);
	color: black;
	background-color: #CFCFCF;
	display: inline-block;
	position: absolute;
	top: 0;
	right: 0;
	font-size: 0.9em;
	border-radius: 0 0 0 5px;
	padding: 0 0.5em;
	text-shadow: none;
}