header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 210;
}

.header-wrapper {
    z-index: 10;
}
.header-top {
    height: 80px;
    background-color: white;
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-left: 50px;
    padding: 10px;
}
.header-left {
    height: 100%;
}
.header-title {
    font-family: "Zen Kaku Gothic New", sans-serif;
    font-weight: 500;
    font-size: 13px;
    line-height: 16px;
    color: #000;
}
.header-logo {
    margin-top: 3px;
    width: 90%;
}
.header-under {
    display: flex;
}
.header-navigation {
    position: relative;
    width: 50%;
    height: 50px;
    background-color: #eaeaea;
    font-size: 15px;
    text-decoration: none;
    color: #000;
    display: flex;
    align-items: center;
    justify-content: center;
}

.header-navigation::after {
    content: "";
    position: absolute;
    left: 0;
    bottom: 0;
    width: 0;
    height: 2px;
    background-color: #000;
}

.header-navigation:hover::after {
    width: 100%;
}
.header-navigation.active::after {
    width: 100%; /* 下線を表示 */
}

.header-top .sidebar-buttons {
    width: 140px;
    height: 60px;
    margin-top: 0;
    padding: 0;
    justify-content: flex-end;
    align-items: center;
}

.header-top .sidebar-buttons .btn-login,
.header-top .sidebar-buttons .btn-register {
    border: none;
    height: 60px;
}

.header-top .sidebar-buttons-top {
    height: 60px !important;
}