Remove gray header on Search Result page on WordPress

Put this css in your style. For Particular page use class “search-results” and you can replace “RED” color with your color. if css not apply then try with “!important” like background-color: red !important;

.search-results .page-header {
    background-color: red;
}

If you like replace color with image then you can use css property “background-image”.