* {
    box-sizing: border-box;
}

body {
    font-size: 18px;
}

label {
    display: block;
}

.nummy {
    border: 1px solid blue;
    padding: 1em 1em 1em 1em;
    width: 100%;
    max-width: 400px;
}
.nummy input {
    display: block;
    padding: 0.25em;
    margin: 0.5em 0;
    font-size: 20px;
    letter-spacing: 1px;
}

.total-inputs {
    display: flex;
    gap: 2em;
    align-items: center;
}

.add-total {
    height: 2em;
    cursor: pointer;
}