screen.css

body {
  background-color: #d5caec;
  color: #333;
  font-family: 'Merriweather Sans', sans-serif;
  margin: 0;
}

h1 {
  font-family: 'Oleo Script Swash Caps', cursive;
}

h2, h3 {
  font-weight: 800;
}

header {
  padding: 1em;
  display: flex;
  align-items: center;
}

header h1 {
  margin: 0 1em 0 0;
}

header nav ul {
  display: flex;
  list-style: none;
  padding-left: 0;
}

header nav ul li {
  margin-right: 1em;
}

header nav ul li a:link,
header nav ul li a:visited {
  color: white;
  text-decoration: none;
  font-size: 2em;
}
header nav ul li a:focus,
header nav ul li a:hover {
  color: pink;
  text-decoration: underline;
}

header nav ul li a:active {
  color: #ffe600;
}

.articles {
  padding: 1em;
}

aside {
  padding: 1em;
}

@media (min-width: 480px) {
  main {
    display: flex;
    flex-direction: row;
  }

  aside {
    width: 300px;
  }

  aside figure {
    margin: 1em 0;
  }

  aside figure img {
    border: thin solid #666;
  }

  aside form.search input {
    width: calc(100% - 1em);
    font-family: 'Merriweather Sans', sans-serif;
    font-size: 1em;
    padding: 0.5em;
    border: thin solid #666;
    border-radius: 2px;
  }

  aside form.sign-in {
    margin: 0.5em 0;
    display: flex;
  }

  aside form.sign-in input {
    display: block;
    width: 110px;
    padding: 0.25em;
    margin-right: 0.5em;
    border: thin solid #666;
    border-radius: 2px;
  }

  aside form.sign-in button {
    display: block;
    padding: 0.25em;
    background-color: #8b43db;
    color: white;
    width: 72px;
    border: thick solid #5d2e91;
    border-radius: 2px;
  }

  .articles {
  }
}

footer {
  padding: 1em;
  display: flex;
  flex-direction: column;
  align-items: center;
}

footer nav {
  display: flex;
  padding: 2em;
  border: thin solid #666;
  border-radius: 2px;
  background-color: #b0a5c7;
  color: white;
}

footer nav section {
  padding: 0 1em;
}

footer nav section:not(:first-child) {
  border-left: thin solid #666;
}

footer nav ul {
  list-style: none;
  padding-left: 0;
}

footer nav h3,
footer nav ul {
  margin: 0;
}