.wp-block-search .wp-block-search__input,
.search-form .search-field,
.widget_search input[type="search"] {
  border: 1px solid #999 !important;
  box-shadow: inset 0 0 0 1px #999 !important;
  background-color: #fff !important;
  outline: none;
}

.wp-block-search .wp-block-search__input:focus,
.search-form .search-field:focus,
.widget_search input[type="search"]:focus {
  border: 1px solid #444 !important;
  box-shadow: inset 0 0 0 1px #444 !important;
  outline: 2px solid transparent;
}