'how src and href properly work in thymleaf?

I wrote following code in main-page.html

<a href="" class="arrow">
     <img th:src="@{/image/right-arrow.png}" alt="back">
</a>

but it said that no mapping

 No mapping for GET /image/right-arrow.png

why it is happening? It is also not working for css my resource files screen

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