.form-floating > .form-control:focus::-moz-placeholder, .form-floating > .form-control:not(:placeholder-shown)::-moz-placeholder {
    color: #b4bdc6;
}

.form-floating > .form-control:not(:-moz-placeholder-shown)::placeholder {
    color: #b4bdc6;
}

.form-floating > .form-control:focus::placeholder,
.form-floating > .form-control:not(:placeholder-shown)::placeholder {
    color: #b4bdc6;
}