HTMLテンプレートやBootstrapを追加

app/assets/scss/material-dashboard/_icons.scss

@@ -0,0 +1,32 @@
+.material-icons {
+  font-family: 'Material Icons Round';
+  font-weight: normal;
+  font-style: normal;
+  font-size: 20px;  /* 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';
+}
+
+.nav.nav-pills {
+  .nav-link {
+    .material-icons {
+      top: 3px;
+    }
+  }
+}