.ribbon-cupo{
    position:absolute;
    top:20px;
    right:-50px;
    width:200px;
    background:#dc3545;
    color:#fff;
    text-align:center;
    font-weight:bold;
    padding:10px 0;
    transform:rotate(45deg);
    z-index:999;
    box-shadow:0 2px 10px rgba(0,0,0,.3);
}

.rounded-20px{
    position:relative;
}