body {
  margin: 0;
  line-height: 1.2;
  font-family: sans-serif;
}
.lists {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-evenly;
}
ul {
  padding: 0;
  width: 45vw;
  min-width: 320px;
  max-width: 640px;
}
li {
  display: flex;
  align-items: center;
  justify-content: space-between;
  list-style: none;
  border-bottom: 1px solid #ccc;
  padding: .25rem;
}
.dismissed {
  opacity: .5;
}
:link {
  text-decoration: none;
}
button {
  flex: 0 0 auto;
  background: none;
  border: 0;
  font-weight: bold;
  line-height: 1;
  cursor: pointer;
  padding: 0;
  outline: none;
  font-size: 1.5rem;
  width: 1.5rem;
  margin-left: .25rem;
}
.topics {
  column-count: 2;
}
.topic {
  -webkit-break-inside: avoid;
  break-inside: avoid;
}

.progress {
  display: flex;
  width: 50vw;
}

.progress > * {
  font-size: small;
  text-align: center;
  color: white;
  background-color: green;
  height: 1rem;
}

.progress .shared {
  opacity: .5;
}