#keyboard {
    background-color: #000;
    position: fixed;
    bottom: 0px;
    width: 100%;
    display: none;
}
#keyboard hr {
    width: 100%;
    height: 2px;
    border: none;
    background-color: #666;
}
.keygroup {
    display: -webkit-box;
    display: -ms-flexbox;
    display: flex;
    -ms-flex-wrap: wrap;
    flex-wrap: wrap;
    padding: 1%;
}
#keyboard button {
    width: 22%;
    -webkit-box-flex: 1;
    -ms-flex-positive: 1;
    flex-grow: 1;
    margin: 0.1em;
    padding: 0.5em;
    font-size: 1.3em;
    color: #fff;
    background-color: #000;
    border: solid 2px #666;
}
#keyboard .close {
    font-family: sans-serif;
    position: absolute;
    right: 0;
    margin-top: -30px;
    color: #fff;
    background: #000;
    width: 25.5%;
    max-width: 120px;
    height: 30px;
    text-align: center;
    line-height: 32px;
    font-size: 25px;
    border-top-left-radius: 0.3em;
    cursor: pointer;
}