html, body {
height: 100%;
}
.App {
margin: 10px;
position: absolute;
top: 0;
bottom: 0;
left: 0;
right: 0;
display: flex;
flex-direction: column;
}
#login {
margin-bottom: 10px;
}
#chat {
width: 100%;
display: flex;
flex-direction: row;
align-items: stretch;
flex: 1;
overflow: auto;
}