> 'mui-btn mui-btn-default mui-btn-flat mui-btn-lg'<p>This would be better implemented via mixins. Eg, the a element has the class 'download-button', which has all the additional visual elements mixed in via sass/less/stylus. There's a small overhead in file size, but it allows you to keep all the visual settings in a single place (the stylesheet) rather than two (the stylesheet and the HTML).