css設置input框沒有邊框，選中時取消背景色

    input {
        outline:none;
        background:transparent;
        border:none;
        outline:medium;
    }
    *:focus { 
        outline: none;
        background-color: transparent;
    }
    ::selection{background:transparent; }
    ::-moz-selection{background:transparent; }