The two left and right chevron glyphicon are not showing, it works, but it shows a square box for some reason. When I click the positions where the glyhicons are I can scroll through pictures so all that is not right is the appearance of the glyphicons the left and right arrow usually expected are not showing?
<!DOCTYPE html>
<html>
<head>
<title>Student Association</title>
<link rel="stylesheet" href="css/bootstrap.min.css">
</head>
<body>
<div class="carousel slide" data-ride="carousel" id="carousel-ex">
<ol class="carousel-indicators">
<li class="active" data-slide-to="0" data-target="#carousel-ex"></li>
<li data-slide-to="1" data-target="#carousel-ex"></li>
<li data-slide-to="2" data-target="#carousel-ex"></li>
<li data-slide-to="3" data-target="#carousel-ex"></li>
<li data-slide-to="4" data-target="#carousel-ex"></li>
<li data-slide-to="5" data-target="#carousel-ex"></li>
</ol>
<div class="carousel-inner">
<div class="item active"><img alt="abuja" class="img-responsive" id=
"afCountries" src="img/african-countries/abuja-nigeria.jpg">
<div class="carousel-caption">
<h3>Abuja, Nigeria</h3>
</div>
</div>
<div class="item"><img alt="accra" class="img-responsive" id="afCountries" src=
"img/african-countries/accra-ghana.jpg">
<div class="carousel-caption">
<h3>Accra, Ghana</h3>
</div>
</div>
<div class="item"><img alt="kigali" class="img-responsive" id="afCountries"
src="img/african-countries/kigali-rwanda.jpg">
<div class="carousel-caption">
<h3>Kigali, Rwanda</h3>
</div>
</div>
<div class="item"><img alt="durban" class="img-responsive" id="afCountries"
src="img/african-countries/durban-southafrica.jpg">
<div class="carousel-caption">
<h3>Durban, South Africa</h3>
</div>
</div>
<div class="item"><img alt="Johannesburg" class="img-responsive" id=
"afCountries" src="img/african-countries/Johannesburg-South_Africa.jpg">
<div class="carousel-caption">
<h3>Johannesburg, South Africa</h3>
</div>
</div>
<div class="item"><img alt="kenya" class="img-responsive" id="afCountries" src=
"img/african-countries/kenya.jpg">
<div class="carousel-caption">
<h3>Kenya</h3>
</div>
</div>
</div>
<a class="left carousel-control" data-slide="prev" href=
"#carousel-ex"><span class="glyphicon glyphicon-chevron-left"></span></a>
<a class="right carousel-control" data-slide="next" href=
"#carousel-ex"><span class=
"glyphicon glyphicon-chevron-right"></span></a>
</div>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"> </script>
<!-- Latest compiled and minified JavaScript -->
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.1/js/bootstrap.min.js"> </script>
</body>
</html>