body {
    margin: 0 auto;
    max-width: 40rem;
    padding: 0 1rem;
    font-family: system-ui, sans-serif;
    line-height: 1.5;
}

header {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    padding: 1rem 0;
    border-bottom: 1px solid #ccc;
}

header a:first-child {
    margin-right: auto;
}

form div {
    margin-bottom: 1rem;
}

label {
    display: block;
}

input,
button {
    box-sizing: border-box;
    font: inherit;
    min-height: 44px;
}

input {
    width: 100%;
    padding: 0.5rem;
}

button {
    padding: 0.5rem 1.5rem;
}

.error {
    color: #b00020;
}