html, body {
    height: 100%;
}

body {
    display: flex;
    min-height: 100vh;
}

main {
    flex: 1 1 auto;
    display: flex;
}

.container {
    flex: 1 1 auto;
    display: flex;
    flex-direction: column;
}

#messages {
    flex: 1 1 auto;
    overflow-y: auto;
    margin-bottom: 0.5rem;
}

.input-group {
    margin-bottom: 0.5rem !important;
}