how to define wordpress contact form 7 placeholder text color

Here is the custom css code:

/*contact form 7 placeholder text color*/
::-webkit-input-placeholder { /* WebKit browsers */
    color: #bbbcbd !important;
    opacity: 1;
}
:-moz-placeholder { /* Mozilla Firefox 4 to 18 */
    color: #bbbcbd !important;
    opacity: 1;
}
::-moz-placeholder { /* Mozilla Firefox 19+ */
    color: #bbbcbd !important;
    opacity: 1;
}
:-ms-input-placeholder { /* Internet Explorer 10+ */
    color: #bbbcbd !important;
    opacity: 1;
}