Hi
I add those tag in my Themes:
/* PGA */
#ppm_home_go img {
background: url(data:image/png;base64,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);
width: 19px;
height: 15px;
}
/* The global search button image PGA */
#ppm_search img {
background-image: url(data:image/png;base64,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);
width: 16px;
height: 15px;
}
In URL: it is the base64 image for the search and for the home button.
You can use thise site to convert png to base64: Image to Base64 Converter - Encode Images to Base64 - Online - Browserling Web Developer Tools