.spinner {
  display: inline-block;
  opacity: 0;
  max-width: 0;

  -webkit-transition: opacity 0.25s, max-width 0.45s; 
  -moz-transition: opacity 0.25s, max-width 0.45s;
  -o-transition: opacity 0.25s, max-width 0.45s;
  transition: opacity 0.25s, max-width 0.45s; /* Duration fixed since we animate additional hidden width */
}

.has-spinner.active {
  cursor:progress;
}

.has-spinner.active .spinner {
  opacity: 1;
  max-width: 50px; /* More than it will ever come, notice that this affects on animation duration */
}