@mixin lamb-nebular-forms-theme() {
    .input-group-addon,
    .form-control {
        &:disabled {
            border-color: nb-theme(form-control-border-color);
            @include install-placeholder(rgba(nb-theme(form-control-placeholder-color), 0.5),
                nb-theme(form-control-placeholder-font-size));
        }
        @include install-placeholder(nb-theme(form-control-placeholder-color),
            nb-theme(form-control-placeholder-font-size));
    }
    select.form-control:not([size]):not([multiple]) {
        height: auto;
    }
}