.custom-keyboard {
    text-align: center;
    padding: 1%;
    border: 3px solid black;
    border-radius: 10px;
    background-color: silver;
    z-index: 9999;
}

.custom-keyboard-input {
    width: 100%;
    height: 34px;
    padding: 6px 12px;
    font-size: 14px;
    line-height: 1.42857143;
    color: #555;
    background-color: #fff;
    background-image: none;
    border: 1px solid #979797;
    border-radius: 4px;
    box-shadow: inset 0 1px 1px rgba(0, 0, 0, .075);
    transition: border-color ease-in-out .15s, box-shadow ease-in-out .15s;
}

.custom-keyboard-button {
    border: 1px solid transparent;
    border-radius: 4px;
    height: 40px;
    line-height: 38px;
    min-width: 40px;
    margin: 2px;
    cursor: pointer;
    background-color: whitesmoke;
    color: black;
}

.custom-keyboard-button-hover {
    border: 1px solid transparent;
    border-radius: 4px;
    height: 40px;
    line-height: 38px;
    min-width: 40px;
    margin: 2px;
    cursor: pointer;
    background-color: cornflowerblue;
    color: white;
}

.custom-keyboard-button-action {
    border: 1px solid transparent;
    border-radius: 4px;
    height: 40px;
    line-height: 38px;
    min-width: 40px;
    margin: 2px;
    cursor: pointer;
    background-color: turquoise;
    color: white;
}

.custom-keyboard-button-disabled {
    border: 1px solid transparent;
    border-radius: 4px;
    height: 40px;
    line-height: 38px;
    min-width: 40px;
    margin: 2px;
    cursor: pointer;
    background-color: lightcoral;
    color: white;
}