<link href="//maxcdn.bootstrapcdn.com/bootstrap/4.1.1/css/bootstrap.min.css" rel="stylesheet" id="bootstrap-css"> <script src="//maxcdn.bootstrapcdn.com/bootstrap/4.1.1/js/bootstrap.min.js"></script> <script src="//cdnjs.cloudflare.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script> <!------ Include the above in your HEAD tag ----------> Check JS Tab

/*Enable SVG*/ add_filter( 'wp_check_filetype_and_ext', function($data, $file, $filename, $mimes) { $filetype = wp_check_filetype( $filename, $mimes ); return [ 'ext' => $filetype['ext'], 'type' => $filetype['type'], 'proper_filename' => $data['proper_filename'] ]; }, 10, 4 ); function cc_mime_types( $mimes ){ $mimes['svg'] = 'image/svg+xml'; return $mimes; } add_filter( 'upload_mimes', 'cc_mime_types' ); function fix_svg() { echo '<style type="text/css"> .attachment-266x266, .thumbnail img { width: 100% !important; height: auto !important; } </style>'; } add_action( 'admin_head', 'fix_svg' ); /*Enable SVG*/