CSS代码：

.text-box{        width:400px;        min-height:120px;        max-height:300px;        _height:120px;        padding:5px;        outline:0;        border:1px solid lightgray;        font-size:12px;        word-wrap:break-word;        overflow-x:hidden;        overflow-y:auto;        _overflow-y:visible;}

HTML代码：

效果图：