body {
    margin: 0;
    padding: 0;
    font-family: Arial, sans-serif;
    overflow-x: hidden;
}

.navbar {
    transition: background-color 0.3s;
}

.navbar.scrolled {
    background-color: white !important;
}

.navbar-nav {
    justify-content: center;
    width: 100%;
}

.nav-item {
    text-align: center;
    padding: 0 20px;
    /* 項目同士を離す */
}

.nav-link {
    color: black !important;
    transition: color 0.3s;
}

.nav-link:hover,
.nav-link:focus {
    color: gray !important;
}

.navbar-brand {
    position: absolute;
    left: 0;
    padding-left: 15px;
}

@media (max-width: 991.98px) {
    .navbar-brand {
        position: static;
        padding-left: 0;
    }
}

.sushi-belt {
    display: flex;
    overflow: hidden;
    height: 100px;
    margin-top: 20px;
    position: relative;
}

.sushi-track {
    display: flex;
    width: calc(200%);
    animation: sushiLeft 10s linear infinite;
}

.sushi-track img {
    height: 100px;
    flex-shrink: 0;
}

@keyframes sushiLeft {
    0% {
        transform: translateX(0%);
    }

    100% {
        transform: translateX(-50%);
    }
}

.center-image {
    text-align: center;
    margin: 20px 0;
}

.center-image img {
    max-width: 70%;
    height: auto;
}

.footer {
    text-align: center;
    padding: 20px;
}

.footer a {
    margin: 0 10px;
    text-decoration: none;
    color: black;
    font-size: 24px;
}