.keyboard{
    position: fixed;
    bottom: 0;
    width: 100vw;
    left: 0;
    background-color: #FFFFFF;
    text-align: center;
    vertical-align: middle;
    font-size:20px;
    z-index: 1;
}
.keyboard td{
    border-top:solid #e0e0e4 1px;
    border-right:solid #e0e0e4 1px;
    width: 25%;
    height: 14vw;
    font-size: 6vw;
}

.keyboard td img{
    max-width: 40%;
    height: auto;
    display: block;
    text-align:  center;
    margin: auto;
}
.keyboard .btn{
    /*background-color: #64d364;*/
    color: #FFFFFF;
}