html {
  background: radial-gradient(#fff, #ccc)
}
body {
  font-family: Calibri,Candara,Segoe,"Segoe UI",Optima,Arial,sans-serif;
  max-width: 720px;
  margin: 0 auto;
}
.lead {
  font-size: 1.5em;
  text-align: center;
}
h1 {
  font-family: "Century Gothic", CenturyGothic, AppleGothic, sans-serif;
  text-align: center;
}
#plot {
  display: block;
  background: #fff;
  margin: 0 auto;
}
#params {
  text-align: center;
  margin: 20px;
}
#params input[type=number] {
  width: 60px;
  text-align: right;
}
label {
  white-space: nowrap;
}