.container {
    max-width: 1200px;
    margin: 0 auto;
}

.grid-cols-12 {
    display: grid;
    grid-template-columns: repeat(12, 1fr);
    gap: 1rem;
}

.grid-cols-12 > div {
    padding: 1rem;
    border: 1px solid #333;
    border-radius: 0.25rem;
}

.form-control {
    margin-top: 1rem;
}

.form-control > input {
    margin-left: 1rem;
    padding: 0.6rem 1rem;
    border: 1px solid #333;
    border-radius: 0.25rem;
}

.form-control > button {
    margin-left: 1rem;
    padding: 0.6rem 1rem;
    border: 1px solid #333;
    border-radius: 0.25rem;
    background-color: #333;
    color: #fff;
    font-size: 1rem;
}

.form-control > button:active {
    background-color: #666;
}

.result {
    margin: 1rem 0;
    padding: 0.6rem 1rem;
    background-color: #333;
    color: #fff;
    font-size: 1rem;
    border-radius: 0.25rem;
}

.result::after {
    content: "";
    clear: both;
    display: block;
}

.result span {
    float: right;
}

.hidden {
    display: none;
}