/* PANTALLA PRINCIPAL */
.display {
    display: flex;
    flex-direction: column;
    justify-content: flex-end;
    margin: 50px 0 10px 0;
    height: 60px;
}

.operation {
    color: #aaa;
    font-size: 14px;
    text-align: right;
    height: 25px;
}

.numbers {
    border: 0;
    outline: 0;
    text-align: right;
    flex: 1;
    font-size: 45px;
    transition: font-size 0.2s ease-in-out;
    overflow: hidden;
    white-space: nowrap;
}