#source-block-alert {
        display: none;
        position: fixed;
        inset: 0;
        z-index: 2147483647;
        background: rgba(0,0,0,0.25);
        align-items: center;
        justify-content: center;
    }

    #source-block-alert.active {
        display: flex;
    }

    #source-block-box {
        width: 420px;
        max-width: calc(100% - 30px);
        background: #171d17;
        color: #fff;
        border: 1px solid #444;
        border-radius: 12px;
        padding: 20px;
        box-shadow: 0 10px 30px rgba(0,0,0,.5);
        font-family: Arial, sans-serif;
    }

    #source-block-domain {
        font-weight: bold;
        margin-bottom: 15px;
        font-size: 14px;
    }

    #source-block-message {
        font-size: 14px;
        margin-bottom: 25px;
    }

    #source-block-footer {
        text-align: right;
    }

    #source-block-ok {
        background: #b8e69f;
        color: #222;
        border: 2px solid #8dc875;
        border-radius: 25px;
        padding: 9px 28px;
        cursor: pointer;
        font-weight: bold;
    }