[qiqitori]

    body::after {
    content: "";
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: linear-gradient(rgba(0, 0, 0, 0.4) 1px, transparent 1px);
    background-size: 2px 2px;
    background-repeat: repeat;
    ...