* {
    padding: 0;
    margin: 0;
    box-sizing: border-box;
}

main {
    width: 85%;
    margin: auto;
}

fieldset>div {
    padding: 1em;
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    row-gap: 0.5em;
    column-gap: 1em;
}

fieldset>div>input { 
    width: 100%;
}

fieldset button {
    display: block;
    margin: auto;
    padding: 4px 8px;
    margin-bottom: 1em;
    font-size: 1.5em;
}