body {
    font-family: system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif;
    margin: 2rem;
    line-height: 1.5
}

nav {
    display: flex;
    justify-content: space-between;
    gap: 1rem;
    margin-bottom: 2rem
}

label {
    display: block;
    margin: .5rem 0
}

input,
textarea {
    width: min(560px, 100%);
    padding: .5rem;
    border: 1px solid #d0d7de;
    border-radius: 6px
}

button,
.btn {
    display: inline-block;
    padding: .6rem 1rem;
    border-radius: 8px;
    border: 1px solid #0ea269;
    background: #12b76a;
    color: #fff;
    text-decoration: none
}

.err {
    color: #b42318
}

code,
pre {
    background: #f6f8fa;
    border: 1px solid #eaeef2;
    border-radius: 6px;
    padding: .5rem;
    display: block;
    overflow: auto
}