index.css

body {
    display: flex;
    flex-direction: row;
    justify-content: center;
    align-content: flex-start;
    font-family: sans-serif;
}

h1 {
    border-bottom: solid black thin;
    font-size: 14pt;
}
h2 {
    font-size: 12pt;
    margin-bottom: 0.2em;
}

#controls {
    margin-right: 2em;
}
#controls > div {
    position: relative;
}
#controls h1 {
    font-variant: small-caps;
    text-align: center;
}
#controls button {
    width: 100%;
}
#controls th {
    white-space: nowrap;
    text-align: right;
}
#controls .sliderLabel {
    width: 2em;
    text-align: center;
    overflow: hidden;
}
#controls .sliderLabel input {
  width: 2em;
  font-size: 12pt;
  text-align: center;
  overflow: hidden;
  border: solid #999 thin;
}
#controls #playerNames, #controls #forbiddenPairs, #controls #discouragedGroups {
    width: 100%;
    box-sizing: border-box;
    resize: none;
}
#controls p {
    font-size: 10pt;
    max-width: 305px;
}

#results {
    width: 50%;
}
#results .conflictScore {
    font-size: 10pt;
    font-weight: normal;
    float: right;
}
#results .groups {
    display: flex;
    flex-direction: row;
    flex-wrap: wrap;
}
#results .groups .group {
    min-width: 120px;
}
#results .groups .group ul {
    margin-top: 0.2em;
    padding-left: 20px;
}

.resultsSummary button {
    float: right;
    margin-left: 1em;
}

input[type=range]::-moz-range-track {
  height: 5px;
  background: #ddd;
  border: none;
  border-radius: 3px;
}

input[type=range]:focus::-moz-range-track {
  background: #ccc;
}

#hide-help-link {
    display: none;
}

.help-text {
    display: none;
    z-index: 10;
    position: absolute;
    box-sizing: border-box;
    left: 100%;
    margin-left: 4px;
    width: 425px;
    background-color: white;
    border: #666 solid thin;
    padding: 1em;
    font-size: smaller;
}

/*
CSS-only loading spinner
source: https://stephanwagner.me/only-css-loading-spinner
*/

@keyframes spinner {
  from {transform: rotate(0deg);}
  to {transform: rotate(360deg);}
}

.spinner {
  position: relative;
}
 
.spinner:before {
  content: '';
  box-sizing: border-box;
  position: absolute;
  top: 50%;
  left: 50%;
  width: 16px;
  height: 16px;
  margin-top: -8px;
  margin-left: -8px;
  border-radius: 50%;
  border: 2px solid #ccc;
  border-top-color: #000;
  animation: spinner .6s linear infinite;
}

/*
Print mode: Something you could hand out to students.
- Full-width results
- Hide controls
- Hide conflict scores
- Hide results footer (timing and export controls)
- Avoid splitting round results across multiple pages
*/
@media print {
  #results { width: unset; }
  #controls { display: none; }
  .conflictScore { display: none; }
  .resultsSummary { display: none; }
  .round { break-inside: avoid; }
}