Try to use the next custom CSS code:
.content-product .stock, .content-product .available-on-backorder {
left: 41px !important;
color: white;
background-color: #141414;
top: 30px;
font-size: 13px;
line-height: 21px;
padding: 3px 6px;
text-transform: capitalize;
}
.content-product p.stock.out-of-stock:before {
display: none;
}
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