body {
    width: 100%;
    margin: auto;
}

.area_header {
    width: 100%;
    height: 100%;
    background-color: lightpink;
    display: flex;
}

.area_navi {
    align-items: center;
}

nav {
    width: 960px;
    height: 25px;
    padding: 10px;
    margin-right: auto;
    margin-left: auto;
    background-color: gray;
    display: block;
}

ul {
    display: flex;
}

li {
    list-style: none;
}

a {
    display: block;
    text-decoration: none;
    color: RED;
    margin-right: 35px;
}

.area_main {
    width: 960px;
    height: 150px;
    margin-right: auto;
    margin-left: auto;
    padding: 10px;
    background-color: lightcyan;
    display: block;
    padding-top: 5px;
}

.area_footer {
    width: 100%;
    height: 70px;
    background-color: aquamarine;
    display: flex;
    align-items: centor;
}