Adding to the Body Class in WordPress

// Adding to the Body Class in WordPress

<body <?php body_class(); ?>>

<body <?php body_class( 'my-class' ); ?>>

// Adding Multiple Body Classes
<body <?php body_class( array( "class-one", "class-two", "class-three" ) ); ?>>

//Conditionally Adding a Body Class
<?php if ( is_shop() ) { body_class( 'is-woocommerce-shop' ); } else { body_class(); } ?>


// Adding a Body Class by Filter (use in functions.php)

add_filter( 'body_class','my_body_classes' );
function my_body_classes( $classes ) {

    $classes[] = 'class-name';

    return $classes;

}


//Adding Multiple Body Classes by Filter
add_filter( 'body_class','my_body_classes' );
function my_body_classes( $classes ) {

    $classes[] = 'class-name';
    $classes[] = 'class-name-two';

    return $classes;

}


//Conditionally Adding a Body Class by Filter
add_filter( 'body_class','my_body_classes' );
function my_body_classes( $classes ) {

    if ( is_shop() ) {

        $classes[] = 'class-name';
        $classes[] = 'class-name-two';

    }

    return $classes;

}


//Adding a Body Class Based on the Page Template
add_filter( 'body_class','halfhalf_body_class' );
function halfhalf_body_class( $classes ) {

    if ( is_page_template( 'page-halfhalf.php' ) ) {
        $classes[] = 'halfhalf-page';
    }

    return $classes;

}


//Removing a Body Class

add_filter( 'body_class', 'adjust_body_class' );
function adjust_body_class( $classes ) {

    foreach ( $classes as $key => $value ) {
        if ( $value == 'woocommerce-page' ) unset( $classes[ $key ] );
    }

    return $classes;

}


source link:http://code.tutsplus.com/tutorials/adding-to-the-body-class-in-wordpress--cms-21077