Not working. i don't know why


#1

script

.nav a {
  color: #5a5a5a;
  font-size: 11px;
  font-weight: bold;
  padding: 14px 10px;
  text-transform: uppercase;
}

.nav li {
  display: inline;
}

.jumbotron {
  background-image:url('http://goo.gl/04j7Nn');
  height: 500px;
  background-repeat: no-repeat;
  background-size: cover;
}

.jumbotron .container {
  position: relative;
  top:100px;
}

.jumbotron h1 {
  color: #fff;
  font-size: 48px;  
  font-family: 'Shift', sans-serif;
  font-weight: bold;
}

.jumbotron p {
  font-size: 20px;
  color: #fff;
}

.learn-more {
  background-color: #f7f7f7;
}

.learn-more h3 {
  font-family: 'Shift', sans-serif;
  font-size: 18px;
  font-weight: bold;
}

.learn-more a {
  color: #00b0ff;
}
.neighborhood-guides {
background-color: #efefef;
     border-bottom: 1px solid #dbdbdb;
     color: #393c3d;
  font-size: 24px;
}
     .neighborhood-guides h2{
         font-size:15px;
         margin-bottom: 13px;
     }
     .neighborhood-guides p {
         background-color: #efefef;
         border-bottom: 1px solid #dbdbdb;
         color: #393c3d;
         font-size: 24px;
     }

#2

Could you tell me which exercise is this, and what is the error message that you are seeing?