How do I change the font-family of the placeholder of <input> elements ?

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CSS

HTML5

bootstrap

This is my HTML Code

I have created a change password form. The placeholder text is displayed in SERIF format. I have tried changing everything but nothing is changing the placeholder to sans-serif. Is it not at all possible to change the font-family of placeholder ?

<form class="form-horizontal" role="form" name="changePwdForm" method="POST" action="">

                     <div class="form-group">
                         <label class="sr-only" for="inputPassword">Current Password</label>
                         <input class="form-control form-input-text" name="currentPassword" type="password" id="currentPassword" maxlength="15" placeholder="Enter Current Password" required>
                     </div>
                     <div class="form-group">
                         <label class="sr-only" for="inputPassword">New Password</label>
                         <input class="form-control form-input-text" name="newPassword" type="password" id="inputPassword" maxlength="15" placeholder="Enter New Password" onkeyup="validateNewPassword(); return false;" required>
                         <span id="validateMessage"></span>
                     </div>
                     <div class="form-group">
                         <label class="sr-only" for="inputPassword">Re-Enter New Password</label>
                         <input class="form-control form-input-text" name="confirmPassword" type="password" id="confirmPassword" maxlength="15" placeholder="Confirm New Password" onclick="validateSubmit();" onkeyup="checkPassword(); return false;" required>
                         <span id="confirmMessage"></span>
                     </div>

                     <div class="center-block">
                         <input name="submit" type="submit" class="btn btn-lg center-block form-btn" value="Submit">
                     </div>
                 </form>

What I have tried:

input {
	font-family: "Times New Roman", sans-serif;
}
::-webkit-input-placeholder {
    font-family: "Times New Roman", sans-serif;
}
:-moz-placeholder {
    font-family: "Times New Roman", sans-serif;
}
::-moz-placeholder {
    font-family: "Times New Roman", sans-serif;
}
:-ms-input-placeholder {
    font-family: "Times New Roman", sans-serif;
}
.form-input-text {
	font-family: "Times New Roman", sans-serif;
}

This is my css code snippet