Hi,

1) You can change easily the search background via the selector which can be added in Appearance > Customize > Additional CSS.

.m-site-search .m-site-search__content {
    background-image: url('new_url');
    background-color: your_color !important
}

If you want to remove the background image and simply add background color, simply add 

background-image: none !important

2) The word Search... is fully translatable and can be translated easily via any plugin. So all you need to go is install and activate the following plugin.

- https://wordpress.org/plugins/say-what/

After that, go to Settings > Text Changes and add the new strings, add the text domain of the theme, in this case 'amartha'.

Feel free to ask for anything you need.

Kind Regards

Hi,

You are welcome anytime, feel free to ask for anything you need.

Simply add the following style:

.m-site-search .m-site-search__content .m-site-search__content__inner .m-site-search__form form {
    background-color: your_color !important;
}

If you like our theme, please leave us a rate with 5 stars at ThemeForest, that would help us a lot.

Kind Regards,
NeuronThemes