body {
  background-color: #F3F3F3;
}

h1 {

}

h2 {

}

.flex-container {
  display: flex;
  flex-wrap: nowrap;
  background-color: #E8E8E8;
}

.flex-container > div {
  background-color: #F8F8F8;
  width: 120px;
  margin: 10px;
  text-align: center;
  line-height: 30px;
  font-size: 18px;
}

.week {
  width: 100%;
  height: auto;
}

.cell {
  display: inline-block;
  vertical-align: top;
  box-sizing: border-box;
  width: 33%;
  height: 100%;
  padding: 0.4em;
  
  border: 0.1em solid white;
  min-height: 6em;
  
  background0color: #f9f9f9;
}

.cell.holiday {
  background-color: #f0c9c9;
}

.header .cell {
  min-height: 0;
  font-weight: bold;
}

.cell .date {
  color: #777777;
}

.cell .topic {
  font-weight: bold;
}

.cell .links {
  list-style: none;
  margin: 0;
  padding: 0;
  margin-top: 0.2em;
}

.cell .links li {
  display: inline-block;
}

.cell .links li:not(:first-of-type)::before {
  content: "|";
  margin: 0 0.2em;
}

.cell .reading {
  list-style: none;
  margin: 0;
  padding: 0;
  margin-top: 0.2em;
}