pre {
  transition: opacity .2s ease-in-out;
}
pre:empty {
  opacity: 0;
}
[data-button] {
  display: block;
  margin: 0 auto;
  width: auto !important;
}
[type="text"],
[type="email"],
[data-theme=dark] form textarea {
  padding: .5em .6em;
  width: 100%;
  margin: 0 0 .5em 0;
  font-size: 12pt;
  border: 1px solid rgba(0,0,0,.25);
  border-radius: 2px;
  background: rgba(0,0,0,.3);
  box-shadow: rgba(0,0,0,.15) 0 1px 0;
  color: rgba(255,255,255,.8);
}
[type="text"]:focus,
[type="email"]:focus,
textarea:focus {
  border-color: #6c71c4;
  box-shadow: #6c71c4 0 0 3px;
}
.error {
  border-color: indianred !important;
}