js-keygen/js-keygen.css

body {
  background-color: #cccccc;
  font: 16px Arial, Tahoma, Helvetica, FreeSans, sans-serif;
}

button#generate {
  background-color: rgb(60, 200, 30);
  padding: 10px;
  margin-top: 5px;
  color: white;
  font-weight: bold;
  font-size: 1.1em;
  border-radius: 8px;
  border-width: 0px;
  margin-right: 20px;
  margin-left: 20px;
  min-width: 120px;
}

div#content {
  background-color: #f0f0f0;
  border-radius: 8px;
  width: 780px;
  margin: auto;
  padding: 20px;
}

label {
  display: inline-block;
  width: 80px;
}
select {
  width: 200px;
}
input {
  width: 180px;
}
textarea {
  margin-top: 10px;
  width: 650px;
  height: 70px;
  word-wrap: break-word;
  font-family: monospace;
  overflow: scroll;
}