Center logo on mobile in WordPress - html

Question

mobileI've looked everywhere for centering a logo on mobile in WordPress, and I can't find anything. Here's what I've styled...
I also want the phone number to move into the navbar on mobile, but one step at a time, right? Any help is greatly appreciated...
Updated with more code. My apologies. I'm not sure if my media query is evey applying. I tested on Firefox and it only shows two of the four styles I've used. Is that normal? The float right and font-size aren't being displayed.
I hope if I can nail this down the other site section will be easier. I do everything in WordPress and I like the functionality. I also want to understand the CSS before I try tackling PHP, if that makes sense.
#media screen and (max-width: 480px) {
a[href^="tel:"] {
color: black;
text-decoration: none;
float: none;
}
.navbar-brand {
margin: 0 !important;
}
}
// ------------- Telephone Styling ------------ //
#telephone {
text-align: center;
margin-top: 15px;
font-size: large;
float: right;
}
a[href^="tel:"] {
color: black;
text-decoration: none;
display: inline;
}
<div class="hfeed site" id="page">
<!-- ******* Header ******* -->
<header>
<div class="wrapper-fluid">
<!-- Your site title as branding in the menu -->
<div class="container">
<div class="row">
<div class="col-md-6">
<?php if ( ! has_custom_logo() ) { ?>
<?php if ( is_front_page() && is_home() ) : ?>
<h1 class="navbar-brand mb-0"><a rel="home" href="<?php echo esc_url( home_url( '/' ) ); ?>" title="<?php echo esc_attr( get_bloginfo( 'name', 'display' ) ); ?>"><?php bloginfo( 'name' ); ?></a></h1>
<?php else : ?>
<a class="navbar-brand" rel="home" href="<?php echo esc_url( home_url( '/' ) ); ?>" title="<?php echo esc_attr( get_bloginfo( 'name', 'display' ) ); ?>"><?php bloginfo( 'name' ); ?></a>
<?php endif; ?>
<?php } else {
the_custom_logo();
} ?>
</div>
<!-- end custom logo -->
<div class="col-md-6">
<div id="telephone">
<p>Call Now<br>
<i class="fa fa-phone"></i>
636-244-9045</p>
</div>
</div>
</div>
</div>
<!-- ******************* The Navbar Area ******************* -->
<div class="wrapper-fluid wrapper-navbar" id="wrapper-navbar">
<a class="skip-link screen-reader-text sr-only" href="#content"><?php esc_html_e( 'Skip to content',
'understrap' ); ?></a>
<nav class="navbar navbar-expand-md navbar-dark bg-dark">
<?php if ( 'container' == $container ) : ?>
<div class="container">
<?php endif; ?>
<button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarNavDropdown" aria-controls="navbarNavDropdown" aria-expanded="false" aria-label="Toggle navigation">
<span class="navbar-toggler-icon"></span>
</button>
<!-- The WordPress Menu goes here -->
<?php wp_nav_menu(
array(
'theme_location' => 'primary',
'container_class' => 'collapse navbar-collapse',
'container_id' => 'navbarNavDropdown',
'menu_class' => 'navbar-nav',
'fallback_cb' => '',
'menu_id' => 'main-menu',
'walker' => new WP_Bootstrap_Navwalker(),
)
); ?>
<?php if ( 'container' == $container ) : ?>
</div><!-- .container -->
<?php endif; ?>
</nav><!-- .site-navigation -->
</div><!-- .wrapper-navbar end -->
</div>
</div>
</header>

Answer 1

Try:
.navbar-brand {
display: block;
text-align: center;
}

Answer 2

I checked your website and I got your problem.
You have for .navbar-brand this code :
display: inline-block;
padding-top: .3125rem;
padding-bottom: .3125rem;
margin-right: 1rem;
font-size: 1.25rem;
line-height: inherit;
white-space: nowrap;
And problem is with display: inline-block; and margin-right: 1rem; these two are stopping your action to center logo.
So replace .navbar-brand like this :
padding-top: .3125rem;
padding-bottom: .3125rem;
font-size: 1.25rem;
line-height: inherit;
white-space: nowrap;
And code to center the logo inside .img-fluid :
display: block;
margin: 0 auto;
This works for sure. Hope you understand.