.km-view {
    font-family: '微软雅黑','宋体', '黑体', Arial, Helvetica, sans-serif;
    -webkit-user-select: none;
    user-select: none;
    position:  relative;
}

.km-view .km-receiver {
    position: absolute;
    left: -99999px;
    top: -99999px;
    width: 20px;
    height: 20px;
    outline: none;
    margin: 0;
}