HTML 代码
<form class="flex items-center w-full max-w-md mx-auto">
<label for="simple-search" class="sr-only">Search</label>
<div class="relative w-full">
<div class="absolute inset-y-0 left-0 flex items-center pl-3 pointer-events-none">
<svg aria-hidden="true" class="w-5 h-5 text-gray-500 dark:text-gray-400" fill="currentColor" viewBox="0 0 20 20" xmlns="http://www.w3.org/2000/svg"><path fill-rule="evenodd" d="M8 4a4 4 0 100 8 4 4 0 000-8zM2 8a6 6 0 1110.89 3.476l4.817 4.817a1 1 0 01-1.414 1.414l-4.816-4.816A6 6 0 012 8z" clip-rule="evenodd"></path></svg>
</div>
<input type="text" id="simple-search" class="bg-gray-50 border border-gray-300 text-gray-900 text-sm rounded-lg focus:ring-blue-500 focus:border-blue-500 block w-full pl-10 p-2.5 dark:bg-gray-700 dark:border-gray-600 dark:placeholder-gray-400 dark:text-white dark:focus:ring-blue-500 dark:focus:border-blue-500" placeholder="Search" required>
</div>
<button type="submit" class="p-2.5 ml-2 text-sm font-medium text-white bg-blue-700 rounded-lg border border-blue-700 hover:bg-blue-800 focus:ring-4 focus:outline-none focus:ring-blue-300 dark:bg-blue-600 dark:hover:bg-blue-700 dark:focus:ring-blue-800">
<svg class="w-5 h-5" fill="none" stroke="currentColor" viewBox="0 0 24 24" xmlns="http://www.w3.org/2000/svg"><path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M21 21l-6-6m2-5a7 7 0 11-14 0 7 7 0 0114 0z"></path></svg>
<span class="sr-only">Search</span>
</button>
</form>