body {
    background-color: #e9edf5;
}
.container {
    background-color: white;
    border: #797c94 dashed;
    border-width: 0 1px;
    width: 800px;
    height: 100vh;
    margin: auto;
}
header {
    background-color: #d5d8eb;
    padding: 2px 10px;
    display: flex;
    justify-content: space-between;
    position: sticky;
    top: 0;
}
header a {
    color: black;
}

h1, h2, h3, h4 {
    margin: 10px 0 5px;
}
main {
    padding: 10px;
}
main ul {
    margin-left: 15px;
}
main li:not(:last-child) {
    margin-bottom: 3px;
}