Add some attributes. Not really fixed.

themes/light/libs/common.css

@@ -118,14 +118,17 @@ table.sticky-table {
 
 .alignright, .rteright {
     float: right;
+    text-align: right;
 }
 .alignleft, .rteleft {
     float: left;
+    text-align: left;
 }
 .aligncenter, .rtecenter {
     margin-left: auto;
     margin-right: auto;
     display: block;
+    text-align: center;
 }
 .centered {
     margin-left: auto;