html {
  height: 100vh;
  overflow: hidden;
}

body {
  display: grid;
  grid-template-rows: auto 1fr auto;
  height: 100%;
  overflow: hidden;
}

.main {
  height: 100%;
  overflow: hidden;
}

.content {
  width: 100%;
  height: 100%;
  padding: 40px;
  overflow-x: auto;
  overflow-y: hidden;
  box-sizing: border-box;
  display: grid;
  place-items: center;
}

.topics {
  font-size: 3em;
  min-height: 0;
  max-height: 100%;
  width: 100%;
  column-count: 2;
  column-gap: 80px;
  column-fill: auto;
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

.topics li:first-child {
  margin-top: 0;
}

.topics li:last-child {
  margin-bottom: 0;
}

.posts {
  font-size: 2.2em;
  text-align: right;
  flex: 1;
}

a {
  text-decoration: none;
}

.post {
  margin-bottom: 25px;
}

ul {
  list-style: none;
  margin: none;
}

.topic a {
  position: relative;
  display: inline-block;
  color: inherit;
  text-decoration: none;
  margin-bottom: 25px;
  transition: color 0.5s ease;
}

.topic a::after {
  content: "";
  height: 2px;
  display: block;
  margin-top: 4px;
  background: currentColor;
  width: 0;
  right: 100%;
  position: absolute;
  transition:
    width 0.5s ease,
    right 0.5s ease;
}

.topic a:hover::after,
.topic a.active::after {
  width: 100%;
  right: 0;
}

@media (max-width: 768px) {
  .topics {
    font-size: 2em;
    padding: 0 20px;
  }

  .posts {
    font-size: 1.47em;
    padding: 0 20px;
  }

  .topic a {
    margin-bottom: 15px;
  }
}