Site crash!

Hi Guys

I tried to change some codes in the class-content-headings, but suddently it gets fucked up…

I just get this message now :

Parse error: syntax error, unexpected ‘:’ in /var/www/healthdane.dk/public_html/wp-content/themes/customizr/parts/class-content-headings.php on line 100

I know what the problem is, but I cant change it? How can I get access again?

https://wordpress.org/plugins/css/