html, body {
    height: 100%;
    margin: 0;
}

.layout-container {
    width: 600px;
    margin: 0px auto;
}

main {
    display: flex;
    flex-direction: column;
    min-height: 93vh;
}

.layout-content {
    width: 100%;
    max-width: 600px;
    margin: 5px auto;
    padding: 10px;
    /* flex: 1;  */
    background: #fff;
    box-shadow: 0px 3px 1px -2px rgba(0, 0, 0, .2), 0px 2px 2px 0px rgba(0, 0, 0, .14), 0px 1px 5px 0px rgba(0, 0, 0, .12);
    border-radius: 5px;
    /* float: left; */
}

.layout-content img {
    width: 100%;
    height: auto;
}

/* Sidebar右上 */
.layout-sidebar-first,.layout-sidebar-second {
    width: 25%;
    max-width: 260px;
    margin: 5px auto;
    padding: 10px;
    background: #fff;
    box-shadow: 0px 3px 1px -2px rgba(0, 0, 0, .2), 0px 2px 2px 0px rgba(0, 0, 0, .14), 0px 1px 5px 0px rgba(0, 0, 0, .12);
    border-radius: 5px;
    /* float: right; サイドバーを右に配置 */
}

.region-footer {
    background: #6091D3;
    color: #fff;
    text-align: center;
    padding: 10px;
}

.region-footer > nav > ul.menu {
    display: flex;
    padding: 10px;
    justify-content: center;
}

.region-footer > nav > ul > li.menu-item {
    margin: 0;
    padding-left: 10px;
}

.region-footer > nav > ul > li.menu-item a {
    color: #fff;
}

@media screen and (max-width: 768px) {
    .layout-container {
        width: 100%;
    }
    .layout-content {
        width: 100%;
        min-width: unset;
    }
    .layout-sidebar-first, .layout-sidebar-second {
        width: 100%;
        max-width: unset;
        float: none;
        clear: both;
    }

}