Hello,
Add the next code in Theme Options > Theme custom CSS:
.search-full-width .et-mini-content.active,
.autocomplete-suggestions {
background-color: #222 !important;
}
.search-full-width .category-grid.text-color-dark .count,
.search-full-width .et-mini-content.active,
.search-full-width-form .products-title,
.search-full-width .category-grid .categories-mask h4,
.autocomplete-no-suggestion {
color: white !important;
}
Regards