grid row mobile view

Hi,
loving the theme!
On our desktop version we have applied formatting to grid row to achieve a layout – but having issues with the mobile view. I’d like the images to stack and be centred (not jenga stylee like we have at the moment!) – can you help?
thanks
http://www.wahooparking12.co.uk/wp-content/uploads/2015/05/Screen-Shot-2015-05-19-at-10.32.25.png

@media only screen and (max-width: 767px)
.responsive #top #wrap_all .av-flex-cells .no_margin {
display: block;
margin: 0;
height: auto !important;
overflow: hidden;
padding-left: 0 !important;
padding-right: 0 !important;
max-width: 100%;
min-width: 100%;
}