main.css

body {
  margin: 0;
  height: 100%;
  font-size: 13px;
}

.titlebar {
  position: fixed;
  background: #222;
  width: 100%;
  height: 22px;
}

.title {
  height: 100%;
  width: 100%;
  display: flex;
  text-align: center;
  -webkit-app-region: drag;
}

.title p {
  margin: auto;
  position: relative;
  right: 22px;
  font-size: 17px;
  font-family: monospace;
  font-weight: bold;
  color: #ff477b;
  display: flex;
  justify-content: center;
  align-items: center;
}

.controls {
  margin-right: 13px;
  position: relative;
  bottom: 22px;
  width: 69px;
  height: 100%;
  float: right;
  display: flex;
}

.controls i {
  margin: 0;
  padding: 0;
  width: 100%;
  height: 100%;
  color: #ff477b;
  display: flex;
  justify-content: center;
  align-items: center;
  -webkit-app-region: no-drag;
}

.wrap {
  padding-top: 22px;
}

textarea, #editor div {
  padding: 0 22px;
  width: 47%;
  height: 100%;
  display: inline-block;
  box-sizing: border-box;
  vertical-align: top;
}

textarea {
  padding: 22px;
  background: #222;
  border: none;
  border-right: 1px solid #ccc;
  font-size: 13px;
  font-family: monospace;
  font-weight: bold;
  color: #ff477b;
  resize: none;
  outline: none;
}