Add CSS for single line and multiple line focus the code is -
$(document).ready(function()
{
document.execCommand('formatblock',false,'p')
// for multiple line focus
var selectedNodes = [];
var sel = rangy.getSelection();
for (var i = 0; i < sel.rangeCount; ++i) {
selectedNodes = selectedNodes.concat( sel.getRangeAt(i).getNodes() );
$(selectedNodes).css("height","40px");
}
// single line focus
var selectedElement = null;
selectedElement = window.getSelection().focusNode.parentNode;
$(selectedElement).css("height","40px");
});
It works for me. Hopefully you also get help from this.