移除input中type=number右边的加减按钮

```移除input中type=number右边的加减按钮
/* 移除input number右边的加减按钮 */ 
input[type="number"]::-webkit-inner-spin-button, 
input[type="number"]::-webkit-outer-spin-button { 
    -webkit-appearance: none; margin: 0; 
} 
input[type="number"] { 
    -moz-appearance: textfield; 
    /* Firefox中移除按钮 */ 
}