如何在Wordpress中覆盖CSS

Question

I'm trying to create a Wordpress child theme, but I can't seem to get it to override styles in the parent theme.

functions.php

<?php

if ( ! function_exists( 'my_theme_enqueue_styles' ) ) {
    add_action( 'wp_enqueue_scripts', 'my_theme_enqueue_styles' );

    function my_theme_enqueue_styles() {
        wp_enqueue_style( 'parent-style', get_template_directory_uri() . '/style.css' );
    }
}

/**
 *    WP Enqueue Stylesheets
 */
if ( ! function_exists( 'rev_cust_enqueue_stylesheets' ) ) {
    add_action( 'wp_enqueue_scripts', 'rev_cust_enqueue_stylesheets' );

    function rev_cust_enqueue_stylesheets() {
        wp_enqueue_style( 'rev-main', get_template_directory_uri() . '/layout/css/rev_main.css', array(), '', 'all' );
    }
}

?>

rev_main.css

#header .top-header .header-navigation ul li {
    margin-left: 40px;
    line-height: 1.375;
    font-weight: normal !important;
    font-size: 1px;
    color: #fff;
    text-transform: uppercase;
    position: relative;
    float: left;
 }

Why isn't my style class not being picked?

Thank you all in advance.

UPDATE

1. I don't think the css file even gets picked up,
2. I have the child theme enabled.

Answer 1

The problem was at:

get_template_directory_uri()

in:

/**
 *    WP Enqueue Stylesheets
 */
if ( ! function_exists( 'rev_cust_enqueue_stylesheets' ) ) {
    add_action( 'wp_enqueue_scripts', 'rev_cust_enqueue_stylesheets' );

    function rev_cust_enqueue_stylesheets() {
        wp_enqueue_style( 'rev-main', get_template_directory_uri() . '/layout/css/rev_main.css', array(), '', 'all' );
    }
}

?>

This points to the parent theme, instead of the child theme.

It should be get_stylesheet_directory_uri as follows:

function rev_cust_enqueue_stylesheets() {
    wp_enqueue_style( 'rev-main', get_stylesheet_directory_uri() . '/layout/css/rev_main.css', array(), '', 'all' );
}