clann.css

aside.sidebar.sidebar--condensed {
	background: #36374c;
}

.sidebar-item--active {
	background-color: #414852;
}

.sidebar-item:hover {
	background-color: #1f2329;
}

.sidebar__header-status-bullet--online {
	background-color: white;
}

.loading-animation {
	background: #36374c;
}

.attachment-image img {
	max-width: 400px;
}
.rc-modal__content {
    overflow-y: auto;
    height: 50vh;
}

Modal height and overflow

.rc-modal__content {
    overflow-y: auto;
    height: 50vh;
}