* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    background-color: #fff;
}

a {
    color: #00F;
}

a:hover {
    color: #FF0000;
}

div.wrapper {
    width: 760px;
    margin: auto;
}

h1 {
    margin: 20px auto;
    text-align: center;
}

h2 {
    font-size: 18px;
    margin-bottom: 10px;
}

h3 {
    font-size: 16px;
    line-height: 1.6;
    margin-bottom: 10px;
}

h3 span{
    font-size: 14px;
}

.main_exhibition_info h2::before {
    content: "◆";
    /* 記号(黒丸)を挿入 */
    color: #FF0099;
    /* 好きな色にする */
    font-size: 0.8em;
    /* 黒丸の大きさに差異があるので調整 */
    margin-right: 0.5em;
    /* 余白 */
    margin-left: 0.5rem;
}

p {
    font-size: 15px;
    line-height: 1.8;
    margin-bottom: 10px;
}

span {
    font-size: 12px;
}

.center_text{
    text-align: center;
}

ul.navi_menu {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 0 10px;
    width: 100%;
    margin: 20px auto;
    font-size: 14px;
}

ul.navi_menu li {
    list-style: none;
    border-right: 1px solid #333;
    padding-right: 10px;
}

ul.navi_menu li:last-child {
    border: none;
}

div.main_set {
    width: 765px;
    margin: auto;
    display: flex;
}

.main_leftright {
    width: 180px;
    background-color: #FFFFCC;
    text-align: center;
}

.main_leftright img {
    width: 100%;
    margin-bottom: 20px;
}

.main_exhibition_info {
    width: 400px;
    margin: 20px auto;
    text-align: left;
}

.main_exhibition_info h3,
.main_exhibition_info p{
margin-left: 1.5rem;
}

hr {
    height: 0;
    margin: 20px auto;
    padding: 0;
    border: 0;
}

.hr_line {
    border-top: 1px solid #eee;
}

.hr_dot {
    border-top: 1px dotted #eee;
}

.footer {
    margin-top: 20px;
    text-align: center;
}