Hi @ENAMUL_HAQUE ,
If you want to use a completely custom theme/template, you should better use the original underlying library SearchinGhost. Basically, the “EASY” version (in this topic) is just one implementation of the library to make it super easy for “non I.T.” persons.
About SearchinGhost, only a little bit of configuration is required because the default values are generally a good fit but if you want to tweak everything, here is the official options documentation. You will probably need to update the inputId and template fields.
As a bonus, if you are using a JS framework (like Vue.js, react, etc), you can use SearchinGhost purely as a library without DOM interactions, see this documentation section.
I hope that is useful to you 