I have two buttons in tailwindcss in my
<div class="flex flex-row">
<button class="-ml-px relative inline-flex items-center space-x-2 px-4 py-4 border border-blue-300 text-sm font-medium rounded-l-md text-white bg-blue-500 hover:bg-blue-600 focus:outline-none focus:ring-1 focus:ring-indigo-500 focus:border-blue-500">
<span>Add</span>
</button>
<button class="-ml-px relative inline-flex items-center space-x-2 px-4 py-4 border border-gray-300 text-sm font-medium text-gray-900 bg-gray-50 hover:bg-gray-100 focus:outline-none focus:ring-1 focus:ring-indigo-500 focus:border-blue-500">
<span>Set</span>
</button>
</div>
one button is blue and other is grey. I want to switch colour when I click on Set Button and also same when I click back to Add button again.
As I mentioned, Livewire is for interaction with backend code. If you want to style frontend elements following frontend interaction, use a JS Framework like AlpineJS or plain CSS.
If you really just want to change focus color, you can go with a variation of @Digvijay's answer:
<div class="flex space-x-4">
<button class="flex px-4 py-2 bg-gray-100 text-gray-900 cursor-pointer hover:bg-blue-200 focus:text-blue-700 focus:bg-blue-200 focus:outline-none focus:ring-blue-600" tabindex="1">Add</button>
<button class="flex px-4 py-2 bg-gray-100 text-gray-900 cursor-pointer hover:bg-blue-200 focus:text-blue-700 focus:bg-blue-200 focus:outline-none focus:ring-gray-600" tabindex="2">Set</button>
</div>
(see https://play.tailwindcss.com/mwspfpsTuU)
If you want the colors to stick even after the focus is lost, you may use something like this with AlpineJS:
<div x-data="{ highlightedButton: '' }" class="flex space-x-4">
<button @click="highlightedButton='add'" class="flex px-4 py-2 bg-gray-100 text-gray-900 hover:bg-blue-200" :class="{'bg-blue-400': highlightedButton === 'add'}" tabindex="1">Add</button>
<button @click="highlightedButton='set'" class="flex px-4 py-2 bg-gray-100 text-gray-900 hover:bg-blue-200" :class="{'bg-blue-400': highlightedButton === 'set'}" tabindex="2">Set</button>
</div>
And finally if you keep track of the Add / Set state in the Livewire component anyways (which is hard to tell because there is no livewire code in your markup at all), then do it like @AliAli described in his answer. :-)