html, body {
    height: 100%;

    display: flex;
    flex-direction: column;
}

#app {
    flex: 1 1 0;

    display: flex;
    flex-direction: column;
}

h1 {
    font-size: 20px;
    font-weight: bold;
    margin: 0;
    margin-bottom: 10px;
}