@mixin lamb-nebular-input-group-theme() {
    .input-group-sm > .form-control {
        font-size: nb-theme(form-control-font-size-sm);
        padding: nb-theme(form-control-padding-sm);
        @include install-placeholder(nb-theme(form-control-placeholder-color),
            nb-theme(form-control-font-size-sm));
    }
    
    .input-group-lg > .form-control {
        font-size: nb-theme(form-control-font-size-lg);
        padding: nb-theme(form-control-padding-lg);
        @include install-placeholder(nb-theme(form-control-placeholder-color),
            nb-theme(form-control-font-size-lg));
    }
}