Make the button more visibly clickable by adding a shadow

src/lib/PanelButton.svelte

@@ -7,4 +7,4 @@
 	export let buttonIcon;
 </script>
 
-<a href={clickUrl} target="_blank" on:click={clickHandler} on:contextmenu={rightClickHandler}><p class="flex flex-row items-center bg-neutral-700 p-2 rounded-md {(clickUrl != null || clickHandler != null) ? "hover:bg-neutral-500 cursor-pointer" : ""}" title={buttonTooltip}><img src={buttonIcon} class="inline w-8 h-8"/><span class="ml-1">{buttonText}</span><slot></slot></p></a>
+<a href={clickUrl} target="_blank" on:click={clickHandler} on:contextmenu={rightClickHandler}><p class="flex flex-row items-center bg-neutral-700 p-2 rounded-md shadow-md shadow-neutral-900 {(clickUrl != null || clickHandler != null) ? "hover:bg-neutral-500 cursor-pointer" : ""}" title={buttonTooltip}><img src={buttonIcon} class="inline w-8 h-8"/><span class="ml-1">{buttonText}</span><slot></slot></p></a>