WordPress get SVG file contents

get-svg.php

<?php echo file_get_contents( get_stylesheet_directory_uri() . '/img/icons/your-logo-file.svg' ); ?>

Since Wordpres 4.7.0 there is cleaner way for getting files from parent/child theme using these function:

• get_theme_file_uri(),
• get_parent_theme_file_uri(),
• get_theme_file_path(),
• get_parent_theme_file_path().

Also, try using get_template_directory() instead of get_template_directory_uri()

Use something like:
<?php echo file_get_contents(get_template_directory().'/theme/img/chevron-right-solid.svg'); ?>

Sometimes using get_template_directory_uri() will throw an SSL error

Then, you can target the SVG and style how you wish.
For example:

<button class="btn btn-primary">
  <?php echo file_get_contents(get_template_directory().'/theme/img/chevron-right-solid.svg'); ?>
</button>

CSS might be:

.btn svg { line-height: 1.2; max-height: 1rem;}