content-area.scss

/* BE Like Content
--------------------------------------------- */

.icon-thumbs-up {
	fill: $white;
	stroke: $grey_5;
}

.be-like-content {
	color: $slate_2;
    @include font-sizes( 16px, 18px, 20px );
	display: inline-block;
	font-weight: 600;
	text-decoration: none;

	.icon-thumbs-up {
		display: block;
		fill: $white;
		stroke: $grey_5;
		float: left;
		width: 32px;
		height: 32px;
		margin-right: 16px;
		transition: all 0.1s ease-in-out;
	}

	&:hover .icon-thumbs-up,
	&.liked .icon-thumbs-up {
		fill: $social_thumbsup;
		stroke: $white;
	}

	&:hover {
		text-decoration: none;
	}

	& > span {
		transition: all 0.3s ease-in-out;
	}
}

functions.php

<?php

/**
 * Like Content Icon
 *
 */
function ea_like_content_icon( $text ) {
  $icon = file_get_contents( get_template_directory() . '/assets/icons/thumbs-up.svg' );
	return $icon . $text;
}
add_filter( 'be_like_content_display_count', 'ea_like_content_icon' );