body {
    font: 16px/1.5 system-ui, sans-serif;
    margin: 0;
    color: #1d1d1f;
    background: #fafafa;
}

header {
    display: flex;
    justify-content: space-between;
    padding: 1rem 2rem;
    background: #1d1d1f;
}

header a,
header span {
    color: #fff;
    margin-left: 1rem;
    text-decoration: none;
}

main {
    max-width: 760px;
    margin: 2rem auto;
    padding: 0 1rem;
}

input,
select,
textarea {
    display: block;
    width: 100%;
    padding: 0.5rem;
    margin: 0.25rem 0 1rem;
    box-sizing: border-box;
}

button {
    padding: 0.6rem 1.2rem;
    background: #6b3fa0;
    color: #fff;
    border: 0;
    border-radius: 6px;
    cursor: pointer;
}

.err {
    color: #b00020;
}

li {
    margin: 0.4rem 0;
}