.woocommerce-LoopProduct-link{
position: relative;
}
.woocommerce-LoopProduct-link .out-of-stock{
position: absolute;
background:red;
color:white;
padding:4px 10px;
right: 0;
top:0;
}
.agotado {
right: 1px;
font-size: 16px;
position: absolute;
background: red;
color: white; right: -64px;
top: 0;
}