Tailwind CSS class: .col-span-1

    <div class="grid grid-cols-12 gap-4 h-30">
        <div class="p-4 col-span-1 bg-teal-400">1</div>
        <div class="p-4 bg-gray-400">2</div>
        <div class="p-4 bg-gray-400">3</div>
    </div>