body{

    font-family: "Microsoft YaHei", sans-serif;

    color: #333;

}

.container{

    position: fixed;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;


    display: flex;
    justify-content: center;
    align-items: center;
}

.form{

    width: 300px;

    padding: 16px 32px;

    border: 1px solid #aaa;

    border-radius: 4px;

    display: flex;
    justify-content: center;

    flex-flow: row wrap;

}