I am just getting started with angular material. I have downloaded and referenced all the files as the usage instruction on here. And then copied all html code from here to try out the buttons. I got most of it working including click animations but it doesn't have any theme such as md-primary. This is what i got.

I have referenced angular-material.css but i can't find md-primary or any css classes in there. What am I missing to reference or how to create those css classes for angular material? This is how it looks like on the demo page.

My code sample.
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title></title>
<meta name="viewport" content="initial-scale=1, maximum-scale=1, user-scalable=no" />
<link href="../bower_components/angular-material/angular-material.css" rel="stylesheet" />
<link href="style.css" rel="stylesheet" />
</head>
<body ng-app="YourApp">
<div ng-controller="YourController">
<md-content>
<section layout="vertical" layout-sm="horizontal" layout-align="center center">
<md-button>Button</md-button>
<md-button noink class="md-primary">Primary (noink)</md-button>
<md-button disabled class="md-primary">Disabled</md-button>
<md-button class="md-warn">Warn</md-button>
<div class="label">flat</div>
</section>
<section layout="vertical" layout-sm="horizontal" layout-align="center center">
<md-button class="md-raised">Button</md-button>
<md-button class="md-raised md-primary">Primary</md-button>
<md-button disabled class="md-raised md-primary">Disabled</md-button>
<md-button class="md-raised md-warn">Warn</md-button>
<div class="label">raised</div>
</section>
<section layout="vertical" layout-sm="horizontal" layout-align="center center">
<md-button class="md-fab" aria-label="Time">
<md-icon icon="/img/icons/ic_access_time_24px.svg" style="width: 24px; height: 24px;"></md-icon>
</md-button>
<md-button class="md-fab" aria-label="New document">
<md-icon icon="/img/icons/ic_insert_drive_file_24px.svg" style="width: 24px; height: 24px;"></md-icon>
</md-button>
<md-button class="md-fab" disabled arial-label="Comment">
<md-icon icon="/img/icons/ic_comment_24px.svg" style="width: 24px; height: 24px;"></md-icon>
</md-button>
<md-button class="md-fab md-primary" md-theme="cyan" aria-label="Profile">
<md-icon icon="/img/icons/ic_people_24px.svg" style="width: 24px; height: 24px;"></md-icon>
</md-button>
<div class="label">FAB</div>
</section>
<section layout="vertical" layout-sm="horizontal" layout-align="center center">
<md-button class>Reset</md-button>
<md-button class>RSVP</md-button>
<div class="label">Button Group</div>
</section>
<section layout="vertical" layout-sm="horizontal" layout-align="center center">
<md-button class="md-primary" md-theme="green">Button</md-button>
<md-button class="md-primary md-raised" md-theme="indigo">Button</md-button>
<md-button class="md-primary md-raised" md-theme="orange">Button</md-button>
<md-button class="md-primary" md-theme="cyan">Button</md-button>
<div class="label">Themed</div>
</section>
</md-content>
</div>
<script src="../bower_components/angular/angular.js"></script>
<script src="../bower_components/angular-aria/angular-aria.js"></script>
<script src="../bower_components/angular-animate/angular-animate.js"></script>
<script src="../bower_components/hammerjs/hammer.js"></script>
<script src="../bower_components/angular-material/angular-material.js"></script>
<script>
// Include app dependency on ngMaterial
angular.module('YourApp', ['ngMaterial'])
.controller("YourController", YourController);
function YourController() {
}
</script>