.container p, .container a, .container li {
            font-size: 16px;
        }
        .navbar {
            background-color: #fff;
        }
        .navbar-nav {
            justify-content: center;
            width: 100%;
            display: flex;
            flex-wrap: wrap;
        }
        .nav-item {
            flex: 1;
            max-width: 250px;
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            height: 100px;
            box-sizing: border-box;
            position: relative;
        }
        .nav-link {
            display: flex;
            align-items: center;
            justify-content: center;
            color: #de0037;
            font-size: 16px;
            font-weight: bold;
            text-align: center;
            width: 100%;
            box-sizing: border-box;
            text-decoration: none;
            height: 100%;
            padding: 0;
        }
        .nav-link i {
            font-size: 24px;
            margin-right: 10px;
        }
        .nav-link span {
            display: block;
            padding-left: 10px;
            padding-bottom: 20px;
        }
        .nav-link:hover {
            color: #de0037;
        }
        .nav-item:not(:last-child) .nav-link::after {
            content: '';
            position: absolute;
            right: 0;
            top: 0;
            height: 100%;
            border-right: 1px solid #ccc;
        }
        .nav-item:hover .nav-link {
            opacity: 0.5; /* ホバー時に透明度を50%に設定 */
            transition: opacity 0.5s ease; /* スムーズなトランジションを追加 */
        }
        .arrow {
            width: 25px;
            height: 16.5px;
            position: absolute;
            bottom: 5px;
            left: 50%;
            transform: translateX(-50%);
        }
        .arrow::before,
        .arrow::after {
            content: "";
            position: absolute;
            bottom: 0;
            left: calc(50% - 2.5px);
            width: 4px;
            height: 12px;
            border-radius: 9999px;
            background-color: #de0037;
            transform-origin: 50% calc(100% - 2.5px);
        }
        .arrow::before {
            transform: rotate(45deg);
        }
        .arrow::after {
            transform: rotate(-45deg);
        }
        .nav-item:last-child .nav-link {
            font-size: 12px;
        }
        .heading-container {
            display: flex;
            align-items: center;
            justify-content: center;
            border-bottom: 1px solid #de0037;
            margin: 50px 0;
            position: relative;
        }
        .heading-container::before {
            content: '';
            width: 5px;
            height: 100%;
            background-color: #de0037;
            position: absolute;
            left: 0;
        }
        .heading-text {
            font-size: 24px;
            font-weight: bold;
            color: #000;
            text-align: center;
            padding-left: 0;
            margin: 5px 20px 10px 20px;
        }
        .custom-heading-1 {
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 32px;
            font-weight: bold;
            color: #de0037;
            margin: 75px 0 50px 0;
            text-align: center;
        }
        .custom-heading {
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 24px;
            font-weight: bold;
            color: #de0037;
            margin: 50px 0 50px 0;
            text-align: center;
        }
        .custom-heading i {
            font-size: 24px;
            margin-right: 10px;
        }
        .custom-heading span {
            display: inline-block;
        }
        .col-bg-pink {
            background-color: #fce5eb;
        }
        .content-box {
            padding: 30px 15px 30px 15px;
            height: 100%;
            box-sizing: border-box;
        }
        .custom-card {
            border: 4px solid #ccc;
            padding: 20px;
            text-align: center;
        }
        .custom-card-2 {
            padding: 20px;
            text-align: center;
        }
        .custom-button-2 {
            border: 1px solid #de0037;
            color: #de0037;
            padding: 10px 20px;
            text-decoration: none;
            display: inline-block;
            font-weight: bold;
            background: linear-gradient(to right, #de0037 50%, #fff 50%);
            background-size: 200% 100%;
            background-position: right bottom;
            transition: background-position 0.3s ease, color 0.3s ease;
            width: 65.5%;
        }
        .custom-button-2:hover {
            background-position: left bottom;
            color: #fff;
        }
        .mt-5 {
            padding-right: 0;
            padding-left: 0;
            margin-bottom: 50px;
        }
        .line {
            border-top: 2px solid #ccc;
            width: 100%;
        }
        ul .phishinglist{
            list-style-type: disc;
            padding-left: 3rem;
        }
        @media (max-width: 768px) {
            .navbar-nav {
                flex-direction: row;
            }
            .nav-item {
                flex: 1 1 50%;
                height: auto;
                padding: 10px 0 20px 0;
                border-top: 1px solid #ccc;
            }
            .nav-item:nth-child(2n) .nav-link::after {
                border-right: none;
            }
            .nav-item:nth-child(1),
            .nav-item:nth-child(2) {
                border-top: none;
            }
            .custom-heading-1 {
                margin: 100px 0 50px 0;
            }
        }
        .u_icon_blank:before {
            content: ""; /* 空のコンテンツに設定 */
            /* または */
            /* content: none; */
        }
        .img-fluid {
            padding-left: 30px;
            padding-right: 30px;
        }