body {
  font-family: Helvetica, Arial, sans-serif
}

h1 {
  background-color: #2a5599;
  color: #FFFFFF;
  padding: 5px;
}

.mainView {
  display: flex;
  flex-grow: 1;
}

.mainView div {
  border: solid 1px #000000;
  width: 100%;
}