body {
/*
    baackground: linear-gradient(to bottom, #e0f7fa, #b2ebf2);
*/
    font-family: 'Noto Sans JP', sans-serif;
    color: #333;
    margin: 0;
    padding: 0;
    animation: fadeIn 1s ease-in-out;
}

nav {
    background-color: #4dd0e1;
    padding: 10px;
    text-align: center;
}

nav a {
    color: white;
    margin: 0 15px;
    text-decoration: none;
    font-weight: bold;
}

nav a:hover {
    text-decoration: underline;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.content {
    padding: 20px;
    animation: fadeIn 0.5s ease-in-out;
}