body {
  margin: 2rem 4rem;
  padding: 0;
  font-family: "Source Sans Pro", sans-serif;
}

body * {
  box-sizing: border-box;
}

h1 {
  font-weight: 300;
  margin: 1rem 0;
}

h4 {
  color: #777;
}

/* Controls */
#controls {
  display: flex;
  flex-wrap: wrap;
  margin: 1rem 0;
}

.control {
  margin-right: 2.5rem;
}

.control-header {
  margin: 0.5rem 0;
  padding: 0.2rem 0;
  padding-right: 1rem;
  border-bottom: 1px solid rgb(0 0 0 / 15%);
}

input,
select {
  width: 100%;
  padding: 0.5rem 0.4rem;
  font-family: "Source Sans Pro", sans-serif;
  color: #555;
  border: 1px solid rgb(0 0 0 / 15%);
  border-radius: 4px;
}

input:focus,
select:focus {
  outline: 1px solid #71c2f4;
}

/* Chart */
#container {
  width: 90%;
  max-width: 900px;
  margin-top: 2rem;
  padding: 2rem;
  border: 1px solid rgb(0 0 0 / 7%);
  box-shadow: 2px 2px 35px rgb(0 0 0 / 4%);
}

/* Responsive charts */
@media (min-width: 900px) {
  #container {
    width: 70vw;
  }
}