main.css

html, body { height: 100%; margin: 0; }

body {
  font-family: sans-serif;
}

header {
  padding-top: 5vw;
  text-align: center;
}

main {
  padding: 0 0.5rem;
}

section {
  max-width: 40rem;
  margin: 1rem auto;
  padding: 1rem;
  background-color: #ebebeb;
  box-shadow: 0 0.1rem 0.2rem #bebebe;
}

form .row {
  display: none;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1rem;
  text-align: left;
}

form .row:first-child {
  display: flex;
}

form button {
  text-align: center;
}

input {
  margin-left: 1rem;
}

input[type="number"] {
  border: 1px solid gray;
  padding: 1rem;
  width: 5rem;
  border-radius: 0.5rem;
  font-size: 1rem;
}

button {
  font-size: 1rem;
  padding: 0.5rem 1rem;
}

footer {
  font-size: 0.8rem;
  color: gray;
  margin-top: 2rem;
  line-height: 1.2rem;
  text-align: center;
}

footer h2 {
  font-size: 1em;
  font-weight: 700;
  margin: 1em 0 0 0;
}

footer span {
  white-space: nowrap;
}

footer span::after {
  content:'\00a0\00B7';
}

footer span:last-child::after {
  content:'';
}

#settings {
  text-align: center;
}

#hint {
  color: gray;
  display: none;
  font-size: 0.8em;
  margin: 1em 0;
}

#footnote {
  display: none;
}

#result {
  text-align: center;
  font-size: 2rem;
  display: none;
}
#infected-now {
  font-weight: bold;
}

#chart {
  position: relative;
  width: 100%;
  height: 13rem;
}