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.docbook .xref img[src^=images\/callouts\/], .screen img, .programlisting img, .literallayout img, .synopsis img { width: 1em; } .calloutlist img { width: 1.5em; } .prompt, .screen img, .programlisting img, .literallayout img, .synopsis img { -moz-user-select: none; -webkit-user-select: none; -ms-user-select: none; user-select: none; }