.event_nav {
    display: flex;
    flex-wrap: wrap;
    gap: 5px;
    margin: 0;
    padding: 0;
    list-style: none;
}
.event_nav li {
  flex-basis: 6em;
    font-size: 16px;
    padding: 0;
    margin: 0;
}
.event_nav li::before {
  content: "・"
}
.event_ttl {
      font-size: 20px;
    margin: 30px 0 20px;
}

.event_nav_old {
    display: flex;
    flex-wrap: wrap;
    gap: 5px;
    margin: .6em 0 0;
    padding: 0;
    list-style: none;
}

.event_nav_old li {
    font-size: 14px;
    padding: 0;
    margin: 0;
}
.event_nav_old li::before {
  content: "・"
}

.left-nav {
  background: url(../img/nav_bg.jpg) top left no-repeat;
  min-height: 353px;
}
.left-nav ul {
margin: 0;
    list-style: none;
    padding: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    width: 230px;
    box-sizing: border-box;
}
.left-nav li {
  margin: 0 0 18px;
}
.left-nav li a {

}

map::after {
content: "トップページ";
    width: 118px;
    height: 24px;
    display: block;
    position: absolute;
    top: 9px;
    left: 653px;
    color: #FFF;
    font-weight: bold;
    font-size: 13px;
    pointer-events: none;
}

map::before {
    content: "";
    display: inline-block;
    margin-right: 8px;
    width: 0;
    height: 0;
    border-top: 6px solid transparent;
    border-bottom: 6px solid transparent;
    border-left: 10px solid #ffffff;
    position: absolute;
    left: 639px;
    top: 13px;
}

.left-nav ul li:nth-child(6) {
    display: none;
}