styles.css

html {
    font-family: -apple-system, BlinkMacSystemFont, Segoe UI, Roboto, Helvetica,
        Arial, sans-serif;
    background: #fff;
    color: #333;
    line-height: 1.5;
}

body {
    padding: 2rem;
    max-width: 40rem;
}

a {
    color: #354ed8;
    text-decoration-color: #b4c0ff;
    text-decoration-line: underline;
    text-decoration-skip: ink;
}

form {
    margin-top: 2em;
}

body > h1 {
    font-size:1.5em;
    font-weight: 500;
}

body > h1 a {
    color: inherit;
    text-decoration: none;
}

body > h1 span {
    margin: 0 .25em;
    color:#dbd8cc;
    font-weight:300;
}


/**
 * Section Toggle
 */
h1 svg {
    position: absolute;
    right: 0;
    top: 0.5em;
    width: 1em;
}

h1 button {
    all: inherit;
    position: relative;
    width: 100%;
    box-sizing: border-box;
    padding-right: 2em;
    cursor: pointer;
}

h1 button:focus svg {
    outline: 2px solid;
}

[aria-expanded='true'] svg {
    transform: scaleY(-1);
}

/**
 * Autocomplete
 */
input,
ul button {
    color: inherit;
    font-size: inherit;
    font-family: inherit;
}

input,
input + ul {
    box-sizing: border-box;
    width: 10em;
    border: 2px solid #aaa;
    border-radius: 0.5rem;
    margin: 0;
}

input {
    padding: 0.5rem 0.625rem;
    box-shadow: inset 0 0.25rem 0.25rem rgba(0, 0, 0, 0.15);
}

input:focus {
    outline:none;
    border-color:#6b7ce0;
}

input + ul:empty {
    display: none;
}

input + ul {
    list-style: none;
    padding: 0;
}

ul button {
    padding: 0.5rem 0.625rem;
    margin: 0;
    box-sizing: border-box;
    width: 100%;
    text-align: left;
    background: transparent;
    border: none;
    cursor: pointer;
}

label {
    display: block;
    margin-bottom: 1em;
    font-weight: 500;
}

code {
    font-size:1.125em;
    padding:.125em .25em;
    color:#483e1d;
    background:#f3f0e6;
    border-radius: .25em;
    white-space: nowrap;
}