bootstrap中input标签的上下前头怎么取消

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http://stackoverflow.com/questions/3790935/can-i-hide-the-html5-number-input-s-spin-box

input::-webkit-outer-spin-button,
input::-webkit-inner-spin-button {
    /* display: none; <- Crashes Chrome on hover */
    -webkit-appearance: none;
    margin: 0; /* <-- Apparently some margin are still there even though it's hidden */
}