body {
    background-color: #000000;
    color: #ffffff;
    margin: 0px;
}

p, a { font-size: 24px; }

p, h2 {
    margin: 0px;
}

a {
    color: #800080;
    text-decoration: none;
}

a:hover {
    color: #00ffff;
    text-decoration: none;
}

.zengamen {
    width: 100%;
    height: 100%;
}

.grid-gengo {
    display: grid;
    grid-template: repeat(2, 1fr) / repeat(2, 1fr);
    gap: 8px;
}

.flex-row-mannnaka {
    display: flex;
    flex-direction: column;
    flex-wrap: wrap;
    align-items: center;
    justify-content: center;
    gap: 8px;
    column-count: 2;
}

.flex-row {
    display: flex;
    flex-direction: row;
    flex-wrap: wrap;
    align-items: flex-start;
    justify-content: flex-start;
    gap: 8px;
}

.nav-span {
    margin-top: 8px;
    width: 256px;
    height: 100%;
}

.nav-btn {
    position: relative;
    width: 256;
    height: 64;
}

.nav-yuukou {
    background: linear-gradient(to right, transparent 60%, #000000),
                repeating-linear-gradient(to bottom, #80008040 0 4px, #000000 4px 8px);
}

.nav-btn img {
    position: relative;
    width: 100%;
    height: 100%;
    z-index: 2;
}

.nav-btn h2 {
    position: absolute;
    margin: 0px;
    top: 50%;
    left: 16px;
    transform: translate(0, -50%);
    cursor: default;
    z-index: 1;
}