Problems to capture Title of php (content-home) and change it in CSS

Hello i've got php code

<?php
 
global $post;
$postclass = '';
 
if ( '' != get_the_post_thumbnail() ) {
	$thumb = get_the_post_thumbnail( $post->ID, 'post-thumbnail', array( 'title' => esc_attr( get_the_title() ) ) ) . '<span class="no-thumbnail">' . get_the_title() . '</span>';
}
 
else {
	$args = array(
				'post_type' => 'attachment',
				'numberposts' => 1,
				'post_status' => null,
				'post_mime_type' => 'image',
				'post_parent' => $post->ID,
			);
 
	$first_attachment = get_children( $args );
 
	if ( $first_attachment ) {

Question on applying multiple classes

Hello,

I am quite new at CSS and therefore looking for help in understanding CSS.

I have a html file:

<tr>
<td class="level3 column bd-ob_TaxedTurnoverSuppliesServicesGeneralTariff">Omzet leveringen/diensten belast met algemeen tarief
</td>
<td class="level3 has data monetaryItemType bd-ob_TaxedTurnoverSuppliesServicesGeneralTariff">EUR 100
</td>
</tr>
<tr>
<td class="level3 bd-ob_ValueAddedTaxSuppliesServicesGeneralTariff">Omzetbelasting leveringen/diensten algemeen tarief
</td>

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