Making a website with Hugo style

style.css

:root {
  --color-alpha: rgb(255, 64, 136);
  --color-beta: rgb(0, 131, 192);
  --color-gamma: rgb(51, 186, 145);
  --color-delta: rgb(252, 216, 4);
  --color-omega: #f8f9fa;
  --color-text: #0a1922;
  --lh: 1.6;
  --fz: 16px;
}

* {
  box-sizing: border-box;
  padding: 0;
  margin: 0;
}

body {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  color: var(--color-text);
  font-family: sans-serif;
  font-size: var(--fz);
  font-weight: 100;
  line-height: var(--lh);
}

h1,
h2 {
  font-weight: 400;
}

h1 {
  font-size: 2em;
}

h2 {
  font-size: 1.75em;
}

h1,
h2,
p {
  padding-bottom: .75em;
}

a {
  color: var(--color-beta);
  text-decoration: none;
}

a:hover,
a:focus,
a:active {
  text-decoration: underline;
}

ul {
  padding-left: 1em;
}

li {
  padding-bottom: .5em;
}

main,
nav {
  width: 100%;
  max-width: 960px;
  margin-left: auto;
  margin-right: auto;
}

header {
  background-image: linear-gradient(to bottom, transparent 2px, var(--color-omega) 2px), linear-gradient(to right, var(--color-alpha) 25%, transparent 25%), linear-gradient(to right, var(--color-beta) 50%, transparent 50%), linear-gradient(to right, var(--color-gamma) 75%, transparent 75%), linear-gradient(to right, var(--color-delta) 100%, transparent 100%);
}

nav {
  padding: 1em;
  display: flex;
}

nav a {
  padding: .25em 1em;
}

.active {
  color: var(--color-alpha);
}

main {
  flex: 1 1 auto;
  padding: 2em;
  display: grid;
  grid-template-areas: "content"
    "sidebar";
  grid-gap: 1em;
}

main section {
  grid-column: 1 / -1;
}

.list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  grid-gap: 3em;
}

.list__item h1 {
  font-size: 1.5em;
}

.list__item h2 {
  font-size: 1.33em;
}

footer {
  background-image: linear-gradient(to top, transparent 2px, var(--color-omega) 2px), linear-gradient(to right, var(--color-alpha) 25%, transparent 25%), linear-gradient(to right, var(--color-beta) 50%, transparent 50%), linear-gradient(to right, var(--color-gamma) 75%, transparent 75%), linear-gradient(to right, var(--color-delta) 100%, transparent 100%)
}


@media screen and (min-width: 768px) {
  :root {
    --fz: 20px;
  }

  main {
    grid-template-areas: "content sidebar";
    grid-auto-columns: 1fr 280px;
  }
}