This is a ‘Custom Modification’ theme of the standard osTT Client side theme. This type of customisation is a professionally designed version of the theme that can be purchased off-the-shelf. The process is fairly simple; if you are interested in a responsive version of osTicket for your brand and business, contact me here, including in the form a small amount of information about your requirements and your business. I will then send you some high-fidelity mockups of your new theme. Once you are happy, you will be able to download the theme. An installation service is also available, please enquire.