*{
    margin: 0;padding: 0;
}
.box{
    position: fixed;
    z-index: 1;
    top: 0;right: 0;bottom: 0;left: 0;
}
.display{
    display: flex;align-items: center;justify-content: center;
    direction: ltr;
}
.mt50{
    margin-top: 50px;
}
.mt10{
    margin-top: 10px;
}
#msg{
    max-width: 500px;
    word-wrap: break-word;  /* 允许长单词或URL换行 */
    overflow-wrap: break-word;
}
.textarea{
    padding: 10px;
}