startbootstrap/_sass/_extensions.scss

.new-badge {
    position: absolute;
    top: -0.5rem;
    right: -0.5rem;
    display: flex;
    height: 2.5rem;
    width: 2.5rem;
    justify-content: center;
    align-items: center;
    border-radius: 100%;
    transform: rotate(15deg);
}