¿Cómo cambiar el color del header del theme?

<!--<Header>-->
		<header class="Header BX Row">
			<?php mt_h1(); ?>
			<div class="HeaderNav CenterFx">
				<input type="checkbox" id="ButtonMenu" hidden="hidden">
				<label for="ButtonMenu" class="ButtonMenu CenterFx fa-bars"></label>
				<nav class="HeaderMenu">
                    <ul>
						<?php wp_nav_menu(array('container' => false, 'theme_location' => 'menu_header', 'items_wrap' => '%3$s', 'fallback_cb' => 'mt_default_menu')); ?>
					</ul>
				</nav>
				<div class="Logo"><a href="<?php echo esc_url( home_url( '/' ) ); ?>" title="<?php echo esc_attr( get_bloginfo( 'name', 'display' ) ); ?>"><img src="<?php echo $trconf['logo']['url']; ?>" alt="<?php bloginfo( 'name' ); ?>"></a></div>
			</div>			
			<div class="Form-Group Search BRight BotFx">
				<form method="get" action="<?php echo esc_url( home_url( '/' ) ); ?>" id="searchform">
					<input name="s" type="text" placeholder="<?php _e('Search Porno', TR_THEMENAME); ?>">
					<button id="searchsubmit" type="submit" class="fa-search"></button>
				</form>
			</div>
		</header>
		<!--</Header>-->