form:first-child{
    text-align: center;
}

.operaciones{
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    gap: 30px;
}

.operacion {
    display: grid;
    grid-template-rows: 1fr 1fr 1fr;
    width: 50px;
    margin-left: 28%;
}

.operacion input[type="number"]{
    text-align: center;
    border: white;
}

.operacion input[type="number"]:nth-child(2){
    border-bottom: 3px solid black;
}

.corregir{
    padding-top: 1em;
    text-align: center;
}