Update bootstrap-switch.css

.has-switch .text-label {
  text-align: center;
  color: #000000;
  font-size: 14px;
  z-index: -1;
}
not needed

change .has-switch label color to #000000

static/stylesheets/bootstrap-switch.css

@@ -117,11 +117,6 @@
   font-size: 16px;
   line-height: normal;
 }
-.has-switch .text-label {
-  text-align: center;
-  color: #000000;
-  font-size: 14px;
-}
 .has-switch label {
   text-align: center;
   margin-top: -1px;
@@ -130,7 +125,7 @@
   width: 34%;
   border-left: 1px solid #cccccc;
   border-right: 1px solid #cccccc;
-  color: #ffffff;
+  color: #000000;
   text-shadow: 0 -1px 0 rgba(0, 0, 0, 0.25);
   background-color: #f5f5f5;
   background-image: -moz-linear-gradient(top, #ffffff, #e6e6e6);