You can add the <code>fa-paper-plane</code> Font Awesome icon by adding <code><i class="fa fa-paper-plane"></i></code> within your submit <code>button</code> element.
Give your form's text input field a class of <code>form-control</code>. Give your form's submit button the classes <code>btn btn-primary</code>. Also give this button the Font Awesome icon of <code>fa-paper-plane</code>.
All textual <code><input></code>, <code><textarea></code>, and <code><select></code> elements with the class <code>.form-control</code> have a width of 100%.
testString: 'assert($("button[type=\"submit\"]").hasClass("btn btn-primary"), "Give the submit button in your form the classes <code>btn btn-primary</code>.");'
testString: 'assert($("button[type=\"submit\"]:has(i.fa.fa-paper-plane)").length > 0, "Add a <code><i class="fa fa-paper-plane"></i></code> within your submit <code>button</code> element.");'
testString: 'assert($("input[type=\"text\"]").hasClass("form-control"), "Give the text <code>input</code> in your form the class <code>form-control</code>.");'