.section {
    text-align: center;
}

p.creator {
    font-size: 20px;
}

div.calculator {
    display: flex;
    width: 100%;
    max-width: 400px;
    flex-wrap: wrap;
    justify-content: center;
    margin-bottom: 1em;
    margin: 0 auto;
}

div.calculator a {
    min-width: 20%;
    padding: 0.5em;
    opacity: 0.7;
    background: white;
    color: black;
    text-decoration: none;
    margin-right: 3%;
    transition: opacity 0.3s;
    cursor: pointer;
    margin-left: 3%;
    margin-bottom: 4%;
}

@media (min-width: 992px) {
    div.calculator a {
        min-width: 31%;
        padding: 2.5em;
        margin: 1%;
    }
}

div.calculator a:hover {
    opacity: 1;
    transition: opacity 0.3s;
}

.answer {
    min-height: 19px;
}