Hi Handoyo and all ,
I have tried to update the style.css from /public_html/storefront/view/default_html5/stylesheet/style.css Cpanel and clear admin panel cache but it is still the same.
I have updated the content of style.css file via cpanel(live-mode) and tried via FTP client but it seems that the newly updated style.css file is not taking effect.
Can someone please advise on how to solve this, please ? this is the last part for me and I have tried so many suggested ways to fix this but till no resolution. Is there anything i miss out ? After applying changes to style.css file, is there some setting in admin panel i need to disable or enable (beside clearing cache) ?
Alternatively, can someone send me a style.css which already modified ? example like header color is changed(different color from the default html5 template) so i can tried insert/upload to my site and see if this file will take effect ?
Really hope the main logo issue can be solve

Someone who is seeking desperate help ,
Richard