global.css

:root {
  --blue: hsl(207, 78%, 44%);
  --blue-gray: hsl(229, 19%, 18%);
  --dark-purple: hsl(249, 19%, 14%);
  --red: hsl(9, 75%, 66%);
}

nav ul {
  margin: 0;
  padding: 0;
  list-style: none;
  background-color: var(--dark-purple);
  display: flex;
  justify-content: space-evenly;
}

nav ul li {
  display: inline-block;
}

nav ul li.active img {
  filter: brightness(0) invert(1);
}

nav ul li a {
  width: 70px;
  height: 70px;
  display: grid;
  place-items: center;
}

nav ul li.active a {
  background-color: var(--red);
}

header > div {
  display: flex;
  gap: 1rem;
}

header img {
  padding-bottom: 1rem;
}

header h1 {
  font-size: 2rem;
  margin: 0;
}

header p {
  padding-bottom: 1rem;
  margin: 0;
  color: hsla(0, 0%, 100%, 0.6);
}

header hr {
  border-color: hsla(0, 0%, 100%, 0.2);
  margin-bottom: 1rem;
}

body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  padding: 0;
  margin: 0;
  background-color: var(--blue-gray);
  color: white;
  height: 100vh;
  overflow-y: auto;
}

main {
  padding: 1rem;
}

/* width */

::-webkit-scrollbar {
  width: 6px;
  height: 6px;
}

/* Track */

::-webkit-scrollbar-track {
  background: #f1f1f1;
  display: none;
}

/* Handle */

::-webkit-scrollbar-thumb {
  background: #888;
  border-radius: 1rem;
}

/* Handle on hover */

::-webkit-scrollbar-thumb:hover {
  background: #555;
}