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Yes, you can do this with custom CSS. You will also need to use media queries too to detect the viewport size.
/* Smartphones */
@media (max-width: 480px) {
}
/* Smartphones to Tablets */
@media (min-width: 481px) and (max-width: 767px) {
}
/* Tablets */
@media (min-width: 768px) and (max-width: 959px) {
}
/* Desktop */
@media (min-width: 960px) and (max-width: 1199px) {
}
/* Large Display */
@media (min-width: 1200px) {
}
This is how to create a custom CSS compatible with Gantry 4...
Simply create a file called "<TEMPLATENAME>-custom.css" and put this file in the CSS folder of the template (where <TEMPLATENAME> is the name of the template as seen in template manager e.g. rt_iridescent would be rt_iridescent-custom.css). GANTRY4 will automatically load this CSS file. If you wish, you can also have browser specific files by appending, for example, "-ie9" making the filename "<TEMPLATENAME>-custom-ie9.css"
Regards, Mark.