* {
        margin: 0;
        padding: 0;
        box-sizing: border-box;
    }
    body {
        background-color: #e6f2ff;
        font-family: "Microsoft YaHei", sans-serif;
    }
    #header {
        width: 100%;
        padding: 20px 0;
    }


    .portal-container {
        width: 1130px;
        margin: 15% auto 260px auto;
        display: flex;
        justify-content: center;
        gap: 30px;
    }


    .portal-item {
        width: 500px;
        text-align: center; 
    }


    .portal-item img {
        width: 500px;
        height: 100px;
        object-fit: cover;
        display: block;
        margin: 0 auto; 
    }


    .portal-text {
        margin-top: 8px; 
        text-align: center;
    }
    .portal-text a {
        color: rgb(15, 111, 198);
        text-decoration: none;
        font-size: 14px;
    }


    #footer {
        text-align: center;
        padding: 20px 0;
        border-top: 1px solid rgb(15, 111, 198);
        margin-top: 30px;
    }
    #footer p,
    #footer a {
        color: rgb(15, 111, 198);
        text-decoration: none;
        font-size: 14px;
    }