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.form-control:-moz-placeholder {
  opacity: 0;
  //color: #999
}
.form-control::-moz-placeholder {
  opacity: 0;
  //color: #999
}
.form-control:-ms-input-placeholder {
  opacity: 0;
  //color: #999
}
.form-control::-webkit-input-placeholder {
  opacity: 0;
  //color: #999
}