* {
  box-sizing: border-box;
}
html,
body {
  background: #fff;
  font-family: 'Segoe UI', sans-serif;
  font-size: 100%;
  color: #111;
  height: 100%;
  width: 100%;
  margin: 0;
  padding: 0;
  overflow: hidden;
}
textarea {
  width: 100%;
  height: 100%;
  border: 0;
  outline: 0;
  background: #fff;
  overflow-y: auto;
  resize: none;
  opacity: 0.3;
}
button {
  color: #fff;
  border: none;
  font-weight: bold;
  display: inline-block;
  vertical-align: middle;
  cursor: pointer;
  float: left;
}
label {
  display: block;
  overflow: hidden;
  width: 100%;
  user-select: none;
}
h1,
h2,
h3,
h4,
h5,
h6 {
  padding: 0;
  margin: 0;
}