style.css

html,
body {
  max-width: 700px;
  margin: 0 auto;
  border: 0;
  padding: 0;
  background-color: #fff;
  box-sizing: border-box;
  font-family: Arial, Helvetica, sans-serif;
}

*, *:before, *:after {
  box-sizing: inherit;
}

h1 {
  margin-top: 40px;
  font-size: 2.6em;
  text-align: center;
}

.form {
  display: flex;
  flex-wrap: wrap;

  padding: 40px;
  color: white;
  background-color: rgb(34,159,195);
  font-size: 1.4em;
}

label {
  width: 100%;
  line-height: 1.6em;
}

input[type="text"] {
  width: 100%;
  margin-bottom: 1em;
  padding: 10px;
  border: 0;
  border-radius: 4px;
  font-size: 0.8em;
}

button {
  padding: 20px;
  border: 0;
  border-radius: 4px;
  font-size: 1em;
  color: white;
  background-color: #9265ba;
  cursor: pointer;
}

button:hover {
  background-color: #be4eb7;
}

.form-button {
  display: inline-block;
  width: calc(50% - 10px);
  margin: 1em 0 0;
}

.form-button--host {
  margin-right: 20px;
}

.info {
  padding: 0 20px;
  width: calc(100% - 404px);
}

.debug {
  position: fixed;
  top: 0;
  right: 0;
  background-color: red;
  color: white;
  padding: 10px;
}

.players {
    margin: 10px 0 40px;
    padding: 0;
    border: 1px solid #ccc;
    border-radius: 4px;
}

.player {
  list-style: none;
  padding: 10px;
}

.player:nth-child(even) {
  background-color: #f1f1f1;
}