@cometchat/chat-uikit-react/dist/styles/components/CometChatOngoingCall.css

Ready-to-use Chat UI Components for React(Javascript/Web)

.cometchat-ongoing-call,.cometchat:has(> .cometchat-ongoing-call) {
    width: 100%;
    height: 100%;
    border-radius: 0;
    border: none;
    position: absolute;
    left: 0px;
    top: 0px;
    z-index: 10;
}