.top-des {
    display: flex;
    flex-direction: column;
    flex: 1 0 auto;
    box-sizing: border-box;
    padding: 2rem;
    width: 100%;
    max-width: 570px;   /* limit width */
    margin: 0 auto;     /* center horizontally */
    position: relative;
    transition: .15s ease-out;
    border-radius: 6px;
    border: 1px solid #D1D3DA;
    background: #fff;
}
.top-des::after {
    width: calc(100% - 1.6rem);
    left: 1.6rem;
    top: .8rem;
    content: '';
    display: block;
    background: repeating-linear-gradient(315deg, #87888D, #fff .1rem, #fff .35rem);
    position: absolute;
    height: 100%;
    z-index: -1;
}