body {
    font-family: 'Arial', sans-serif;
    margin: 0;
    padding: 0;
    background-color: #ecf2f5;
    color: #4a4a4a;
}

header, nav, section, footer {
    margin: 20px;
    padding: 20px;
}

header {
    background-color: #4682b4;
    color: white;
    text-align: center;
}

nav {
    background-color: #a9caed;
    padding: 1em;
}

nav a {
    color: white;
    text-decoration: none;
    padding: 0.5em 1em;
    margin: 0 1em;
    border-radius: 5px;
    background-color: #5a98c4;
}

nav a:hover {
    background-color: #4682b4;
}

section {
    background-color: white;
    padding: 20px;
}

footer {
    background-color: #4682b4;
    color: white;
    text-align: center;
    padding: 1em;
    bottom: 0;
    width: 100%;
}

footer a {
    color: white; /* 页脚超链接白色 */
    text-decoration: none;
}

footer a:hover {
	 color: #003153;
    text-decoration: underline;
}