File: vendors/gentelella/vendors/mjolnic-bootstrap-colorpicker/docs/includes/examples/09_size.hbs

<input id="cp9" type="text" class="form-control" value="pink"/>
<style>
    .colorpicker-2x .colorpicker-saturation {
        width: 200px;
        height: 200px;
    }

    .colorpicker-2x .colorpicker-hue,
    .colorpicker-2x .colorpicker-alpha {
        width: 30px;
        height: 200px;
    }

    .colorpicker-2x .colorpicker-color,
    .colorpicker-2x .colorpicker-color div {
        height: 30px;
    }
</style>
<script>
    $(function () {
        $('#cp9').colorpicker({
            customClass: 'colorpicker-2x',
            sliders: {
                saturation: {
                    maxLeft: 200,
                    maxTop: 200
                },
                hue: {
                    maxTop: 200
                },
                alpha: {
                    maxTop: 200
                }
            }
        });
    });
</script>