# Theme Modification **URL:** \ **Category:** Themes\ **Created:** [September 10, 2018, 6:58pm UTC](https://forum.ghost.org/t/theme-modification/2993 "2018-09-10T18:58:18Z")\ **Posts on this page:** 5\ **Page:** 1
**Author:** ![jaj-io](https://avatars.discourse-cdn.com/v4/letter/j/9de0a6/32.png) [@jaj-io](https://forum.ghost.org/u/jaj-io)\ **Post date:** [September 10, 2018, 6:58pm UTC](https://forum.ghost.org/t/theme-modification/2993/1 "2018-09-10T18:58:18Z")
I’m in the process of creating a blog. While I am designing a completely custom theme, it will take some time to completely design and develop the theme. I noticed that the Casper theme is quite clean, and with some HTML/CSS modifications, it’ll work quite well until I can complete the work on my long term theme. Few questions: 1. Is there a chance that I’ll be violating any usage rules by doing this? 2. What would be the best way to go about doing this without putting myself in a place to completely screw up my site if Ghost v2.5 drastically changes something that affects the design or functionality? Thanks for the help! ---
**Author:** ![Kevin](https://sea1.discourse-cdn.com/flex015/user_avatar/forum.ghost.org/kevin/32/32_2.png) [@Kevin](https://forum.ghost.org/u/Kevin)\ **Post date:** [September 10, 2018, 7:09pm UTC](https://forum.ghost.org/t/theme-modification/2993/2 "2018-09-10T19:09:02Z")
1. Absolutely not, Casper is designed specifically for this purpose and is [MIT Licensed](https://github.com/TryGhost/Casper/blob/master/LICENSE) so you’re all good 😄 2. Ghost follows [semver](https://semver.org) so won’t introduce any breaking changes for themes until the next major release (3.0.0) and we tend not to have major releases too often - there was ~1year between 1.0.0 and 2.0.0 The worst that can happen within the 2.x series for theme compatibility is that a new feature is introduced that requires some additional CSS/JS or a bit of HTML to implement - the recent gallery feature in 2.1.0 is a good example [Ghost Handlebars Themes - Building a custom Ghost theme - Docs](https://themes.ghost.org/docs/changelog#section-ghost-210) ---
**Author:** ![coyoterj](https://sea1.discourse-cdn.com/flex015/user_avatar/forum.ghost.org/coyoterj/32/2437_2.png) [@coyoterj](https://forum.ghost.org/u/coyoterj)\ **Post date:** [January 29, 2019, 12:31pm UTC](https://forum.ghost.org/t/theme-modification/2993/3 "2019-01-29T12:31:38Z")
Hello! I think of creating a theme based on Casper. Two questions: 🙂 - Is it possible to copy/paste/rename the folder and, then, make the customizations? - What changes are necessary to avoid conflict between them? Thanks! ---
**Author:** ![Kevin](https://sea1.discourse-cdn.com/flex015/user_avatar/forum.ghost.org/kevin/32/32_2.png) [@Kevin](https://forum.ghost.org/u/Kevin)\ **Post date:** [January 29, 2019, 1:02pm UTC](https://forum.ghost.org/t/theme-modification/2993/4 "2019-01-29T13:02:46Z")
> [@coyoterj](#): > > Is it possible to copy/paste/rename the folder and, then, make the customizations? Absolutely > [@](#): > > What changes are necessary to avoid conflict between them? If I’m understanding the question correctly then a folder rename is enough, you may also want to change the theme name in [`package.json`](https://github.com/TryGhost/Casper/blob/master/package.json#L2) ---
**Author:** ![coyoterj](https://sea1.discourse-cdn.com/flex015/user_avatar/forum.ghost.org/coyoterj/32/2437_2.png) [@coyoterj](https://forum.ghost.org/u/coyoterj)\ **Post date:** [January 29, 2019, 1:17pm UTC](https://forum.ghost.org/t/theme-modification/2993/5 "2019-01-29T13:17:36Z")
> [@Kevin](#): > > If I’m understanding the question correctly then a folder rename is enough, you may also want to change the theme name in [`package.json`](https://github.com/TryGhost/Casper/blob/master/package.json#L2) Exactly! I found [this site](https://www.codeforest.net/making-of-ghost-theme) now. It’s so simple… 😳 😳 Thanks a lot @Kevin