* {
  border: none;
  padding: 0;
  margin: 0;
  box-sizing: border-box;
  font-size: 100%;
}
html {
  height: 100%;
}
body {
  font-family: 'Helvetica Neue', sans-serif;
  font-size: 14px;
  background-color: #7c9360;
  height: 100%;
}
article {
  width: 860px;
  margin: 0 auto;
  padding: 30px;
  background-color: #dcdcdc;
  min-height: 100%;
}
button {
  padding: 0.3em 0.8em;
}
input {
  margin-bottom: 0.5em;
}
h1 {
  font-size: 2em;
  font-family: "Courier New";
  margin-bottom: 1em;
  color: #000;
}
h2 {
  color: #000;
  font-size: 1.3em;
  margin-bottom: 0.5em;
}
p {
  margin-bottom: 0.3em;
}
.input {
  vertical-align: top;
  display: inline-block;
  width: 360px;
}
.output {
  vertical-align: top;
  display: inline-block;
  width: 440px;
  display: none;
}
table {
  border-collapse: collapse;
  margin-bottom: 20px;
  background-color: #f0f0f0;
}
table tbody {
  font-family: 'Courier New', monospace;
  font-size: 11px;
  font-weight: 700;
}
table tbody tr:nth-of-type(2n+1) {
  background-color: #ebebeb;
}
table th,
table td {
  border: 1px solid #c8c8c8;
  padding: 5px;
}
table td.error {
  background-color: #f7d5d8;
  color: #770f00;
}
textarea {
  width: 300px;
  height: 300px;
  font-family: "Courier New";
  padding: 1em;
  background-color: #323232;
  color: #fff;
  -webkit-font-smoothing: antialiased;
  -moz-font-smoothing: grayscale;
  font-weight: 700;
  margin-bottom: 3em;
}
#memory {
  margin-bottom: 2em;
}
#memory input,
#memory p {
  display: inline-block;
  background-color: #fff;
  padding: 0.3em 0.8em;
}
#memory input {
  padding: 0.3em 1.2em;
}
#memory span {
  display: inline-block;
  width: 2em;
  border-width: 0 1px 0 0;
  border-collapse: collapse;
  border-color: gray;
  border-style: solid;
  padding: 0 0.4em;
}
#memory span:first-of-type {
  border-width: 0 1px 0 1px;
}