wp-prismatic/css/styles-buttons.css

/* Prismatic - TinyMCE Button Styles */
i.mce-i-code {
	font: 400 20px/1 dashicons;
	padding: 0;
	vertical-align: top;
	speak: none;
	-webkit-font-smoothing: antialiased;
	-moz-osx-font-smoothing: grayscale;
	margin-left: -2px;
	padding-right: 2px;
	}
	i.mce-i-code:before { content: '\f475'; }