Icon of Rainbow

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<svg width="800px" height="800px" viewBox="0 0 24 24" fill="none" xmlns="http://www.w3.org/2000/svg">
<path d="M21 21V12C21 7.02944 16.9706 3 12 3C7.02944 3 3 7.02944 3 12V21M18 21V12C18 8.68629 15.3137 6 12 6C8.68629 6 6 8.68629 6 12V21M15 21V12C15 10.3431 13.6569 9 12 9C10.3431 9 9 10.3431 9 12V21" stroke="#000000" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"/>
</svg>