calc.css

body {
  font-family: "Droid Sans Mono", Courier;
  max-width: 700px;
  margin: 0 auto;
}
p,
h1 {
  text-align: center;
}
.left {
  display: inline-block;
  box-sizing: border-box;
  width: 70%;
}
.right {
  display: inline-block;
  box-sizing: border-box;
  width: 30%;
  vertical-align: top;
}
#inputArea {
  background-color: transparent;
  overflow: hidden;

  border: 2px solid #8bd;

  resize: none;
}
#outputArea {
  padding-left: 20px;
}
#outputArea li {
  white-space: nowrap;
}
#footer {
  clear: both;
}

.matchingArea {
  font-family: "Droid Sans Mono", Courier;
  font-size: 16px;
  line-height: 22px;

  padding: 10px;
  margin: 0;
}
.mainContainer {
  position: relative;
}
ul {
  list-style-type: none;
}
ul.backgroundRuler {
  position: absolute;
  width: 100%;
  background-color: #fff;
  margin: 0;

  z-index: -1;
}
.backgroundRuler li {
  line-height: 21px;
  border-bottom: 1px solid #cce;
  margin: 0;
  padding: 0;
}

#footer {
  padding: 25px 0 15px 0;
  line-height: 1.5;
}

.changed {
  color: #f66;
  text-shadow: 0 0 5px #ff8;
}