.keyboard-number {
    width: 250px;
    height: 250px;
    margin: auto;
}

.keyboard-number td {
    /* height: 16.66%; */
    width: 25%;
    /* height: 100%; */
}

.keyboard-number input {
    width: 100%;
    height: 100%;
    font-size: 20px;
    background-color: #FFF;
    border: 1px solid #eaeaea;
    cursor: pointer;
}

.keyboard-operator>input {
    color: #209cee;
}

.keyboard-operator>input.full {
    color: #0cca50;
}