prism-toolbar.css

div.code-toolbar {
	position: relative;
}

div.code-toolbar > .toolbar {
	position: absolute;
	z-index: 10;
	top: .3em;
	right: .2em;
	transition: opacity 0.3s ease-in-out;
	opacity: 0;
}

div.code-toolbar:hover > .toolbar {
	opacity: 1;
}

/* Separate line b/c rules are thrown out if selector is invalid.
   IE11 and old Edge versions don't support :focus-within. */
div.code-toolbar:focus-within > .toolbar {
	opacity: 1;
}

div.code-toolbar > .toolbar > .toolbar-item {
	display: inline-block;
}

div.code-toolbar > .toolbar > .toolbar-item > a {
	cursor: pointer;
}

div.code-toolbar > .toolbar > .toolbar-item > button {
	background: none;
	border: 0;
	color: inherit;
	font: inherit;
	line-height: normal;
	overflow: visible;
	padding: 0;
	-webkit-user-select: none; /* for button */
	-moz-user-select: none;
	-ms-user-select: none;
}

div.code-toolbar > .toolbar > .toolbar-item > a,
div.code-toolbar > .toolbar > .toolbar-item > button,
div.code-toolbar > .toolbar > .toolbar-item > span {
	color: #bbb;
	font-size: .8em;
	padding: 0 .5em;
	background: #f5f2f0;
	background: rgba(224, 224, 224, 0.2);
	box-shadow: 0 2px 0 0 rgba(0,0,0,0.2);
	border-radius: .5em;
}

div.code-toolbar > .toolbar > .toolbar-item > a:hover,
div.code-toolbar > .toolbar > .toolbar-item > a:focus,
div.code-toolbar > .toolbar > .toolbar-item > button:hover,
div.code-toolbar > .toolbar > .toolbar-item > button:focus,
div.code-toolbar > .toolbar > .toolbar-item > span:hover,
div.code-toolbar > .toolbar > .toolbar-item > span:focus {
	color: inherit;
	text-decoration: none;
}