.hidden-input {
    display: none;
}
.simple-keyboard.hg-theme-default .hg-button {
    font-size: 4rem;
    line-height: 4rem;
    height: auto;
    color: #000;
    padding-top: 34px;
    padding-bottom: 34px;
}
.simple-keyboard.hg-theme-default .hg-row:last-child .hg-button:nth-child(1) {
    width:33.333%;
}
.simple-keyboard.hg-theme-default .hg-row:last-child .hg-button:nth-child(2) {
    width:66.666%;
}