vue.js: Using Chinese fonts in vue-material - css

Question

I am using Vue Material to build a multi-lingual application. How can I declare Chinese fonts to be used?
App.vue
App.vue loads the Material Design font locally.
<script>
import Vue from 'vue'
import VueMaterial from 'vue-material'
import 'vue-material/dist/vue-material.min.css'
import 'vue-material/dist/theme/default.css'
import './assets/material-icons.css'
Vue.use(VueMaterial)
...
...
...
</script>
material-icons.css
At the top of this file, I have added the default/popular Chinese font for Microsoft and MacOS
#font-face {
font-family: 'Microsoft Yahei', '微软雅黑', '宋体';
font-style: normal;
font-weight: normal;
src: local('Microsoft Yahei'), local('微软雅黑');
}
#font-face {
font-family: 'STXihei', '华文细黑', '宋体';
font-style: normal;
font-weight: normal;
src: local('STXihei'), local('华文细黑');
}
#font-face {
font-family: 'Material Icons';
font-style: normal;
font-weight: 400;
src: url(MaterialIcons-Regular.eot); /* For IE6-8 */
src: local('Material Icons'),
local('MaterialIcons-Regular'),
url(MaterialIcons-Regular.woff2) format('woff2'),
url(MaterialIcons-Regular.woff) format('woff'),
url(MaterialIcons-Regular.ttf) format('truetype');
}
.material-icons {
font-family: 'Material Icons';
font-weight: normal;
font-style: normal;
font-size: 24px; /* Preferred icon size */
display: inline-block;
line-height: 1;
text-transform: none;
letter-spacing: normal;
word-wrap: normal;
white-space: nowrap;
direction: ltr;
/* Support for all WebKit browsers. */
-webkit-font-smoothing: antialiased;
/* Support for Safari and Chrome. */
text-rendering: optimizeLegibility;
/* Support for Firefox. */
-moz-osx-font-smoothing: grayscale;
/* Support for IE. */
font-feature-settings: 'liga';
}
Chinese font not used
This is a sample element with Chinese font
<div class="md-button-content">中文字</div>
Inspecting the element using Firefox development tool shows that the Chinese fonts are not applied
How can I ensure the proper Chinese font is used?
Reference: http://www.kendraschaefer.com/2012/06/chinese-standard-web-fonts-the-ultimate-guide-to-css-font-family-declarations-for-web-design-in-simplified-chinese/