.clearfix:after {
    visibility: hidden;
    display: block;
    font-size: 0;
    content: " ";
    clear: both;
    height: 0;
}
.mykb-box{
    width:390px;
    height:370px;
    background:rgba(0,0,0,0.6);
    filter:progid:DXImageTransform.Microsoft.gradient(startColorstr=#99000000,endColorstr=#99000000);
    box-shadow:0 0 10px rgb(43, 42, 42);
    padding:20px;
    border-radius:10px;
    user-select: none;
    -ms-user-select: none;
    position:absolute;
    display: none;
}
.mykb-box ul,.mykb-box li{
    list-style: none;
}
.mykb-box li{
    width:70px;
    height:70px;
    line-height:70px;
    text-align: center;
    background:#f5f5f5;
    border-radius:10px;
    font-weight:bold;
    margin:10px;
    float:left;
    box-shadow: 0px 2px 1px #000;
    color:#1b50a2;
    font-size:24px;
    cursor:pointer;
}
.mykb-box li.active{
    box-shadow:0px -2px 1px #000;
}
.mykb-box .func{color:#fff;width:100px;}
.mykb-box .exit{background:#F44336;}
.mykb-box .del{background:#ff9800}
.mykb-box .clearall{background:#2196F3}
.mykb-box .sure{background: #4CAF50;width:190px;}