body{
  height: 100vh;
  width: 100vw;
  }

.app{
  height: 100%;
  width: 100%;
  background-color: #AAAACC;
  
  display: flex;
  flex-direction: column;
  flex-wrap: nowrap;
  justify-content: flex-start;
  }

.app > .top{
  height: 2rem;
  display: flex;
  flex-direction: row;
  flex-wrap: nowrap;
  justify-content: space-between;
  }

.app > .main{
  display: flex;
  flex-direction: row;
  flex-wrap: wrap;
  justify-content: start;
  }