refactor: Update adventure search filter UI layout

frontend/src/routes/search/+page.svelte

@@ -111,7 +111,7 @@
 {#if myAdventures.length !== 0 && publicAdventures.length !== 0}
 	<h2 class="text-center font-bold text-2xl mb-4">AdventureLog Results</h2>
 {/if}
-
+<div class="flex items-center justify-center mt-2 mb-2">
 	<div class="join">
 		<input
 			class="join-item btn"
@@ -164,6 +164,7 @@
 		/>
 	</div>
 	<button class="btn btn-primary ml-2" type="button" on:click={filterByProperty}>Filter</button>
+</div>
 
 {#if myAdventures.length > 0}
 	<h2 class="text-center font-bold text-2xl mb-4">My Adventures</h2>