Start with default generated template

css/components/breadcrumb.css

@@ -0,0 +1,29 @@
+/**
+ * @file
+ * Styles for breadcrumbs.
+ */
+
+.breadcrumb {
+  padding-bottom: 0.5em;
+}
+.breadcrumb ol {
+  margin: 0;
+  padding: 0;
+}
+[dir="rtl"] .breadcrumb ol {
+  /* This is required to win over specificity of [dir="rtl"] ol */
+  margin-right: 0;
+}
+.breadcrumb li {
+  display: inline;
+  margin: 0;
+  padding: 0;
+  list-style-type: none;
+}
+/* IE8 does not support :not() and :last-child. */
+.breadcrumb li::before {
+  content: " \BB ";
+}
+.breadcrumb li:first-child::before {
+  content: none;
+}