.messages-columns {
    display: flex;
    gap: 2px;
}

.messages-columns-sidebar {
    width: 200px;
    flex-shrink: 0;
    flex-grow: 0;
}

.messages-columns-content {
    flex-shrink: 1;
    flex-grow: 1;
    overflow: hidden;
}

@media (max-width: 800px) {
    .messages-columns {
        flex-direction: column;
    }

    .messages-columns-sidebar {
        width: 100%;
    }
}