Style sheet is not loading propertly

Do you have a backup ?
Does you web hosting have a backup ? You make need to talk to your hosting support for this.

It is to avoid precisely your experience that the child-theme mechanism was created. Next time be sure to start with creating a child theme http://codex.ww.wp.xz.cn/Child_Themes

Hey there,

If you have no backup and you’ve updated the theme then those CSS changes will have been lost.

You should either use a Child Theme or a CSS plugin like:

http://ww.wp.xz.cn/plugins/imporved-simpler-css/screenshots/

Some themes actually have a CSS field so it’s always worth checking first.

Have a fantastic day! 🙂