* {
    font-family: 'Lucida Sans', 'Lucida Sans Regular', 'Lucida Grande', 'Lucida Sans Unicode', Geneva, Verdana, sans-serif;
}

.contenedor {
    background-color: rgba(0, 0, 0, 0.2);
    width: 10rem;
    display: flex;
    flex-direction: column;
    border-radius: .5em;
    margin: 0 auto;
}

#resultado {
    width: 100%;
    background-color: rgba(90, 60, 100, .5);
    padding: 1em 0;
    border-radius: .5em .5em 0 0;
    text-align: center;
}

.botones {
    display: flex;
    flex-direction: row;
    margin-top: 5px;
    text-align: center;
}

.numeros {
    width: 65%;
    border-right: 1px solid white;
    margin-right: 2px;
}

input {
    border-radius: 10px;
    border-color: rgba(0, 0, 0, .2);
}

.operaciones {
    display: flex;
    flex-direction: column;
}