html,
body {
  width: 100%;
  height: 100%;
  background: #fff;
  -webkit-app-region: drag;
}
ul,
li {
  padding: 0;
  margin: 0;
  list-style: none;
}
.content {
  float: left;
  width: calc(100% - 200px);
  margin-left: 200px;
  margin-top: 50px;
}
a {
  text-decoration: none;
}