* {
  margin: 0;
  padding: 0;
}

.app {
  /*width: 100vw;*/
  /*height: 100vh;*/
  width:  auto;
  height: 100%;
  display: flex;
  flex-direction: column;
}

.header {
  
  height: 100%;
  background-color: white;
  box-sizing: border-box;
  border: 3px solid blue;
}

.main {
　color: black;
  display: flex;
  flex-direction: row;
  flex-grow: 1;
}

.nlns {
    color: black;
}

.sidebar {
  width: 140px;
  background-color: white;
  box-sizing: border-box;
  border: 3px solid blue;
}

.content {
  display: flex;
  flex-direction: column;
  flex-grow: 1;
}

.flex-content {
  flex-grow: 1;
  background-color: white;
  box-sizing: border-box;
  border: 3px solid blue;
}

.fixed-content {
  height2 215px;
  background-color: white;
  box-sizing: border-box;
  border: 3px solid blue;
}