.gnavi__wrap {
    width: 1200px;
    margin: 0 auto;
}
.gnavi__lists {
    display: flex;
}
.gnavi__list {
    width: 20%;
    height: 60px;
    background-color: #E5F0F8;
    position: relative;
    transition: all .3s;
}
.gnavi__list:hover {
    background-color: #0071BB;
}
.gnavi__list:not(:first-child)::before {
    content: "";
    width: 1px;
    height: 100%;
    background-color: #fff;
    position: absolute;
    top: 0;
    left: 0;
    transition: all .3s;
}
.gnavi__list:hover::before {
    background-color: #0071BB;
}
.gnavi__list a {
    display: flex;
    justify-content: center;
    align-items: center;
    width: 100%;
    height: 100%;
    text-decoration: none;
    color: #1b4059;
    font-size: 15px;
    letter-spacing: 0.05em;
    font-weight: 600;
    transition: all .3s;
}
.gnavi__list:hover a {
    color: #fff;
}

/* カスタマイズ用CSS */
.dropdown__lists {
    display: none;/*デフォルトでは非表示の状態にしておく*/
    width: 100%;
    position: absolute;
    top: 60px;
    left: 0;
}
.gnavi__list:hover .dropdown__lists {
    display: block;/*Gナビメニューにホバーしたら表示*/
}
.dropdown__list {
    background-color: #004d80;
    height: 60px;
    transition: all .3s;
    position: relative;
}
.dropdown__list:not(:first-child)::before{
    content: "";
    width: 100%;
    height: 1px;
    background-color: #3492d1;
    position: absolute;
    top: 0;
    left: 0;
}
.dropdown__list:hover {
    background-color: #003558;
}
.dropdown__list a {
    display: flex;
    justify-content: center;
    align-items: center;
    color: #fff;
    text-decoration: none;
    position: relative;
}
.dropdown__list a::before {
    content: '';
    display: block;
    width: 6px;
    height: 6px;
    border-top: 2px solid #fff;
    border-left: 2px solid #fff;
    transform: rotate(135deg);
    position: absolute;
    right: 15px;
    top: calc(50% - 5px);
}