.messagebook-container {
    display: flex;
    flex-direction: column;
    flex-grow: 1;
    width: 100%;
    min-height: 0;
}

.message-list {
    display: flex;
    flex-direction: column;
    flex-grow: 1;
    width: 100%;
    min-height: 0;
    overflow-y: auto;
}