'umatrixstyle'
"<style>\n"
+".matrix {position: relative;display:inline-block;vertical-align:middle;margin:5px;}\n"
+".matrix:before, .matrix:after {content: \"\";position: absolute;top: 0;border: 2px solid #000;width: 6px;height:100%;}\n"
+".matrix:before {left: -6px;border-right: 0;}\n"
+".matrix:after {right: -6px;border-left: 0;}\n"
+"</style>\n\n";