.box-020 {
    position: relative;
    max-width: 100%;
    margin: 0 auto;
    padding: 1em 1.5em;
    background-color: #FFF0F4;
    color: #333;
}

.box-020::after {
    position: absolute;
    top: 0;
    right: 0;
    border-width: 0 20px 20px 0;
    border-style: solid;
    border-color: #dfc0c8 #fff;
    box-shadow: -1px 1px 1px rgb(0 0 0 / 5%);
    content: '';
}