.keyboard {
    -webkit-touch-callout: none;
    -webkit-user-select: none;
    -khtml-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    user-select: none
}

.keyboard table {
    border-spacing: 10px;
    border-collapse: separate;
    background-color: #F1F1F1
}

.keyboard table td {
    touch-action: none
}

.keyboard .button {
    background-color: #fff;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.12), 0 1px 2px rgba(0, 0, 0, 0.24);
    width: 60px;
    height: 60px;
    text-align: center;
    font-family: "arial";
    cursor: none;
    color: #000;
    font-size: 22px
}

.keyboard .button:hover {
    background-color: #fafafa
}

.keyboard .button:active {
    background-color: #999;
    color: #fff
}

.keyboard .margin {
    width: 40px;
    height: 50px
}