Regarding the color changes, the main CSS classes you need to change are located in the qa-styles.css file and are the following ones:
.qam-search.turquoise .qa-search {
background: #1abc9c;
}
.qam-search.turquoise .qa-search-field:focus {
border-color: #117964;
}
.qam-search.turquoise .qa-search-button {
background-color: #117964;
}
Regarding removing the search box, it is a bit more complex. Assuming your current fallback search bar works fine in different devices, you will have to:
1. Comment the 2 calls to $this->qam_search(...) located in qa-theme.php. They are the qam_search and sidepanel functions:
// $this->qam_search('the-top', 'the-top-search');
// $this->qam_search();
2. In snow-core.js you could comment the JS code for toggling the search box
// $('#qam-search-mobile').click(function () {
// $(this).toggleClass('active');
// $('#the-top-search').slideToggle('fast');
// });
3. In the qa-styles.css you'll have to get rid of the magnifier icon displayed in lower resolution devices. You can follow a simple approach by adding this CSS rule:
@media (max-width: 979px) {
.qam-search-mobile {
background-image: initial;
border-left: initial;
}
}