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<?php
//* Do NOT include the opening php tag shown above. Copy the code shown below.

<!-- Add body class to all pages on your site: -->

//* Add custom body class to the head
add_filter( 'body_class', 'sp_body_class' );
function sp_body_class( $classes ) {
    
    $classes[] = 'custom-class';
    return $classes;
    
}

<!-- Add body class to a page with a slug of ‘sample-page’: -->

//* Add custom body class to the head
add_filter( 'body_class', 'sp_body_class' );
function sp_body_class( $classes ) {

    if ( is_page( 'sample-page' ) )
        $classes[] = 'custom-class';
        return $classes;

}

<!-- Add body class to a page with an ID of 1: -->

//* Add custom body class to the head
add_filter( 'body_class', 'sp_body_class' );
function sp_body_class( $classes ) {

    if ( is_page( '1' ) )
        $classes[] = 'custom-class';
        return $classes;

}

<!-- Add body class to a category page with a slug of ‘sample-category’: -->

//* Add custom body class to the head
add_filter( 'body_class', 'sp_body_class' );
function sp_body_class( $classes ) {
    
    if ( is_category( 'sample-category' ) )
        $classes[] = 'custom-class';
        return $classes;
        
}

<!-- Add body class to a category page with an ID of 1: -->

//* Add custom body class to the head
add_filter( 'body_class', 'sp_body_class' );
function sp_body_class( $classes ) {
    
    if ( is_category( '1' ) )
        $classes[] = 'custom-class';
        return $classes;

}

<!-- Add body class to a tag page with a slug of ‘sample-tag’: -->

//* Add custom body class
add_filter( 'body_class', 'sp_body_class' );
function sp_body_class( $classes ) {

    if ( is_tag( 'sample-tag' ) )
        $classes[] = 'custom-class';
        return $classes;
        
}

<!-- Add body class to a tag page with an ID of 1: -->

//* Add custom body class to the head
add_filter( 'body_class', 'sp_body_class' );
function sp_body_class( $classes ) {
    
    if ( is_tag( '1' ) )
        $classes[] = 'custom-class';
        return $classes;
    
}