Bootstrap 3.3 navbar-toggle style change

ISSUE:
When you have  navbar  background color as 'white' , bootstrap navbar-toggle button will not be visible as its default style is 'transparancy' with white stripes.

FIX:
Try changing navbar-toggle as below in your custom stylesheet.
  .navbar-toggle {
      background-color: #cdcdcd  ;
}

  .navbar-toggle:hover,
  .navbar-toggle:focus {
  background-color: #f44d3c  ;
border-color: #f44d3c  ;
}

If you try
.navbar-default  .navbar-toggle {
      background-color: #cdcdcd  ;
}
- will not work in bootstrap 3.3.