.alert_background {
    position: fixed;
    top: 0px;
    left: 0px;
    width: 100vw;
    height: 100vh;
    background: rgba(0,0,0, 0.1);
    z-index:99999999999999;
}

.alert_extend {
    position: absolute;
    left: 50%;
    top: 50%;
    background: #fff;
    padding: 15px;
    box-shadow: 0px 0px 15px #333;
    border-radius: 15px;
    transform: translate(-50%,-50%);
    width: 350px;
    min-height: 150px;
}

    .alert_extend::after {
        content: "";
        display: block;
        clear: both;
    }

    .alert_extend > .alert_title {
        font-size: 16px;
    }

    .alert_extend > .alert_context {
        word-break: break-all;
        padding: 15px 0px;
    }

    .alert_extend .alert_btn {
        float: right;
        margin-left: 10px;
    }

    .alert_extend .alert_input {
        margin-bottom: 15px;
    }