.flow-area {
    width: 640px;
    max-width: 640px;
    margin-top: 0rem;
    background-color: blueviolet;
    margin-bottom: .2rem;
}

.flow-area img {
    width: 640px;
    height: auto;
}

.blank-line {
    width: 100%;
    height: 3rem;
    display: flex;
    justify-content: center;
    align-items: center;
}