anchor.diff:    .footer
       p.text-muted
         span.glyphicon.glyphicon-heart
  -      | &nbsp; from Dad
  +      | &nbsp; from Greg
   
   .img-result
  -  img(ng-src='{{responseSrc}}', ng-click='hideResponse()', ng-show='displayResponse')+  img.img-responsive(ng-src='{{responseSrc}}', ng-click='hideResponse()', ng-show='displayResponse')
positive.code: 
    .h1
      .row
        .col-xs-6.text-right Current Score:
        .col-xs-6.text-left {{score}}
  
    .well.h1
  
negative.code:     hr
  
      form.form-horizontal(role='form', ng-submit='verify()', ng-keypress='hideResponse()')
          .form-group
            .col-sm-3
            .col-sm-6
              //- label.col-sm-4.control-label.input-lg(for='answer') Answer:
              input.form-control.input-lg(id='answer', size='5', type='number', autofocus, placeholder='Enter your answer', ng-model='enteredAnswer')
            .col-sm-3
  
        hr
  
        .row
          .col-sm-3
          .col-sm-3
            a.btn.btn-lg.btn-success(ng-click='verify()') Check Answer
          .col-sm-3
            a.btn.btn-lg.btn-primary(ng-click='nextQuestion()') Skip Question
          .col-sm-3
  
    .h4.text-muted
      .row
  