Почему не проходит правильный ответ в 38 уроке bootstrap 3?

.header a, a:hover {
color: #f0ad4e;
text-decoration: none;
}

.header h1 {
letter-spacing: 15px;
font-size: 300%;
}

.header p {
color: white !important;
font-size: 90%;
letter-spacing: 3px;
}


.nav-pills>li.active>a, .nav-pills>li.active>a:focus, .nav-pills>li.active>a:hover {
color: #fff;
background-color: #346270;
}

.nav-pills>li>a {
color: #fff;
}

.nav-pills>li>a:hover {
background-color: #346270;
}


.navbar-inverse {
padding: 1%;
}

@media (max-width: 767px) {
.nav-pills>li {
float: none;
}

.nav-pills {
text-align: center;
}

.header h1 {
font-size: 280%;
letter-spacing: 5px;
}

.header {
text-align: center;
}
}


.clear {
clear: both;
height: 63px;
}

.wrapper {
min-height: 100%;
}

html, body {
height: 100%;
}

.films_block {
text-align: center;
}

.films_block img {
margin-bottom: 5%;
border-radius: 5px;
border: solid 5px #dad7d5;
width: 100%;
}

.film_label {
padding: 2%;
margin-bottom: 4%;
}

.margin-8 {
margin-top: 8%;
}


.panel {
border: none;
}

.panel-body {
background-color: #f9f9f9;
}

.panel-info>.panel-heading {
background-color: #f0ad4e;
color: white;
border-color: transparent;
}

.sidebar-header {
font-size: 120%;
letter-spacing: 2px;
}


.form-control {
border-radius: 0px;
}

.input-lg {
font-size: 14px;
}

footer {
color: #666;
background: #222;
padding: 17px 0 18px 0;
border-top: 1px solid #000;
}

footer a {
color: #999;
}

footer a:hover {
color: #efefef;
}