<svg fill="rgba(0, 0, 0, 0.5)" height="24" viewBox="0 0 24 24" width="24" xmlns="http://www.w3.org/2000/svg">
    <path d="M0 0h24v24H0z" fill="none"/>
    <path d="M4 6H2v14c0 1.1.9 2 2 2h14v-2H4V6zm16-4H8c-1.1 0-2 .9-2 2v12c0 1.1.9 2 2 2h12c1.1 0 2-.9 2-2V4c0-1.1-.9-2-2-2zm-1 9h-4v4h-2v-4H9V9h4V5h2v4h4v2z"/>
</svg>

Use fill-opacity instead of fill: rgba for queue icon svg
Use fill-opacity instead of fill: rgba for queue icon svg
