/* ease of use variable for the navbar height */
:root {
    --nav-height: 70px;
}

html, body {
    height: 100%;
    background: white;
    margin: 0;
}

.wrapper {
    display: grid;
    grid-template-rows: auto auto;
    grid-template-columns: auto;
}

nav {
    background: blue;
    position: sticky;
    top: 0;
    z-index: 2;
    height: var(--nav-height);
}

ul {
    display: flex;
    flex-flow: row;
    list-style: none;
}

li {
    padding: 10px;
    background: black;
    color: white;
}

h1 {
    margin: 0;
}

.content {
    height: 100%;
    background: black;
}

div.blah1, div.blah2, div.blah3 {
    border: 5px solid rgb(128, 8, 8);
    margin: 5px;
    background: black;
    color: #26ff00;
    text-shadow: 1px 1px black;
    padding: 5px;
}

div.blah1 h1 {
    position: sticky;
    top: var(--nav-height);
    background: violet;
}

div.blah2 h1 {
    position: sticky;
    top: var(--nav-height);
    background: yellow;
}

div.blah3 h1 {
    position: sticky;
    top: var(--nav-height);
    background: chartreuse;
}