Bootstrap has its own styles for <code>button</code> elements, which look much better than the plain HTML ones.
Create a new <code>button</code> element below your large kitten photo. Give it the <code>btn</code> and <code>btn-default</code> classes, as well as the text of "Like".
testString: 'assert(new RegExp("like","gi").test($("button").text()) && ($("img.img-responsive + button.btn").length > 0), "Create a new <code>button</code> element with the text "Like".");'
testString: 'assert($("button").hasClass("btn") && $("button").hasClass("btn-default"), "Your new button should have two classes: <code>btn</code> and <code>btn-default</code>.");'
testString: 'assert(code.match(/<\/button>/g) && code.match(/<button/g)&&code.match(/<\/button>/g).length === code.match(/<button/g).length,"Makesureallyour<code>button</code> elements have a closing tag.");'