Image slide show by Visual Composer.

Hello,

You seem to be using an external plugin that adds a bottom margin.
Please note that untested plugins are not covered by the theme support but we try to help out where we can if the modification is not very time consuming.
Please use this css to remove the extra space:

.flexslider{
margin:0!important;
}

You can add the code in the theme panel-custom css box.

Thanks.