* {
        padding: 0px;
        margin: 0px;
    } 
    .pwd-box{  
        width:310px;
        height: 48px;
        position: relative;  
        border: 1px solid #9f9fa0;  
        border-radius: 3px;  
        overflow:hidden;
        margin: 10px auto;
    }  
    .pwd-box input[type="number"]{  
        width: 100%;  
        height: 100%;  
        /*color: transparent;  */
        /*letter-spacing 属性增加或减少字符间的空白*/
        /*letter-spacing: 35px;*/
        position: absolute;  
        top: 0;  
        left: 0;  
        border: none;  
        font-size: 18px;  
        opacity: 0;  
        z-index: 1;       
        outline: none;
    }
    .fake-box {
        width: 100%;
        height: 100%;
        display: flex;
        flex-flow: row;
    }
    .fake-box input{
        flex: 1;
        width: 100%;  
        height: 100%;  
        border: none;  
        border-right: 1px solid #e5e5e5;  
        text-align: center;  
        font-size: 30px;
        float: left;  
    }  
    .fake-box input:nth-last-child(1){  
        border:none;  
    }