/* 全体設定*/
body {
    font-family: "Arial", sans-serif;
    line-height: 1.6;
    margin: 0;
    padding: 0;
    background-color: #f9f9f9;
}


/*　ヘッダー*/
header {
    background-color: #438ee4;
    color: white;
    padding: 20px;
    text-align: center;
}


nav {
    background-color: #333;
}

nav ul {
    list-style: none;
    display : flex;
    justify-content: center;
    margin: 0;
    padding: 0;
}

nav ul li {
    margin: 0 15px;
}

nav ul li a {
    color:white;
    text-decoration: none;
    padding: 15px 0;
    display: block;
}

nav ul li a:hover {
    background-color: #444;
}

main {
    padding:20px;
    max-width: 800px;
    margin: auto;
    background-color: white;
}

h2 {
    color: #cc0000;
}

h3 {
    color: #f9f9f9;
}

.red{
    color:red;
}

footer {
    background-color: #333;
    color: white;
    text-align: center;
    padding: 15px;
    margin-top: 20px;
}