html, body {
  margin: 0;
  background-color: #333;
  color: #fff;
}
body {
  font-family: monospace;
  font-size: 16px;
  line-height: 1.5;
  padding: 10px;
}
.preview-image {
  /* width: 500px; */
  /* transform: scale(0.5); */
}
.wrap {
  padding: 10px 30px;
}
.control-panel {
  position: sticky;
  top: 10px;
  background: #333333bf;
  padding: 5px;
  border-radius: 6px;
  display: inline-block;
}

.result {
  border: 2px solid #535353;
  border-radius: 8px;
  margin-bottom: 20px;
  display: inline-block;
  background: #222222;
  box-shadow: 2px 2px 9px 1px #000, -1px -2px 8px -3px #fff;
}
.view-result {
  border-collapse: collapse;
  padding: 8px;
  font-family: monospace;
}

.view-result td {
  padding: 10px;
  border-bottom: 1px solid #585858;
  border-left: 1px solid #6a6a6a;
  min-width: 145px;
  text-align: right;
  text-wrap: nowrap;
}
.view-result td:first-child {
  border-left: none;
  text-align: left;
}
.view-result tr:last-child td {
  border-bottom: none;
}
.number-fib {
  margin-bottom: 35px;
}
#input-number {
  width: 40px;
  font-size: 16px;
  background: #333;
  color: #fff;
  border: 1px solid #ddd;
  border-radius: 2px;
  padding: 3px;
  box-shadow: 0px 0px 3px -1px #FFF inset;
}

.run {
  background: #222222;
  width: 80px;
  height: 38px;
  border: 2px solid #535353;
  border-radius: 8px;
  position: relative;
  color: #fff;
  text-align: left;
  font-size: 16px;
  font-family: monospace;
  box-shadow: 2px 2px 9px 1px #000, -1px -2px 8px -3px #fff;
  padding-left: 15px;
  cursor: pointer;
  transition: color .3s ease-in-out;
}
.run::before {
  content: '';
  display: block;
  width: 0;
  height: 0;
  border-top: 10px solid transparent;
  border-left: 15px solid #fff;
  border-bottom: 10px solid transparent;
  position: absolute;
  top: 20%;
  right:10%;
  transition: right .3s ease-in-out;
}
.run:hover {
  color: transparent;
}
.run:hover::before {
  right: 36%;
}

.run:active {
  box-shadow: 0px 0px 8px 1px #000, -2px -2px 8px -3px #fff;
  background: #111;
}

a {
  color: #fff;
}
.list {
  font-size: 20px;
  line-height: 2.2;
}