Firefox 4 Required input form RED border/outline

Solution 1:

There's some new pseudo selectors for some of the new HTML5 form features available to you in CSS. You're probably looking for :invalid. The following are all from the MDC Firefox 4 docs:

• The :invalid CSS pseudo-class is applied automatically to elements whose contents fail to validate according to the input's type setting

• The :-moz-submit-invalid pseudo-class is applied to the submit button on form fields when one or more form fields doesn't validate.

• The :required pseudo-class is now automatically applied to fields that specify the required attribute; the :optional pseudo-class is applied to all other fields.

• The :-moz-placeholder pseudo-class has been added, to let you style placeholder text in form fields.

• The :-moz-focusring pseudo-selector lets you specify the appearance of an element when Gecko believes the element should have a focus indication rendered.

Solution 2:

To be more specific you need to apply that style to the input control.

input:invalid {
    box-shadow: none;
}

Solution 3:

use this code as Quick and simple solution

:invalid {
  box-shadow: none;
}

:-moz-submit-invalid {
  box-shadow: none;
}

:-moz-ui-invalid {
  box-shadow:none;
}

Reference:- https://developer.mozilla.org/en-US/docs/Web/CSS/:invalid