add alert classes for flex-positioning and images

res/css/components/alert.less

@@ -27,6 +27,16 @@
     display: block;
 }
 
+.alert-flex {
+    display: flex;
+    align-items: center;
+    justify-content: flex-start;
+}
+
+.alert-image {
+    margin-right: 1rem;
+}
+
 .alert-page {
     position: fixed;
     bottom: 0;