Overleaf/services/web/public/stylesheets/app/editor/chat.less

@new-message-height: 80px;

#chat-wrapper {
	> .ui-layout-resizer > .ui-layout-toggler {
		display: none !important;
	}
}

.chat {
	.loading {
		font-family: @font-family-serif;
		padding: @line-height-computed / 2;
		text-align: center;
	}
	
	.no-messages {
		padding: @line-height-computed / 2;
	}
	
	.first-message {
		position: absolute;
		bottom: 0;
		width: 100%;
		padding: @line-height-computed / 2;
	}
	
	.messages {
		position: absolute;
		top: 0;
		left: 0;
		right: 0;
		bottom: @new-message-height;
		overflow-x: hidden;
		li.message {
			margin: @line-height-computed / 2;
			.date {
				font-size: 12px;
				color: @gray-light;
				border-bottom: 1px solid @gray-lightest;
				margin-bottom: @line-height-computed / 2;
				text-align: center;
			}
			.avatar {
				margin-top: 14px;
				float: left;
				width: 50px;
				height: 50px;
				border-radius: 50%;
				overflow: hidden;
				img {
					width: 100%;
				}
			}
			.message-wrapper {
				margin-left: 50px + @line-height-computed/2;

				.name {
					font-size: 12px;
					color: @gray-light;
					margin-bottom: 4px;
					min-height: 16px;
				}
				.message {
					border-left: 3px solid transparent;
					font-size: 14px;
					box-shadow: -1px 2px 3px #ddd;
					border-raduis: @border-radius-base;
					position: relative;
					
					.message-content {
						padding: @line-height-computed / 2;
						overflow-x: auto;
					}

					.arrow {
						right: 100%;
						top: @line-height-computed / 4;
						border: solid;
						content: " ";
						height: 0;
						width: 0;
						position: absolute;
						pointer-events: none;
						border-top-color: transparent !important;
						border-bottom-color: transparent !important;
						border-width: 10px;
					}
				}
				p {
					margin-bottom: @line-height-computed / 4;
					&:last-child {
						margin-bottom: 0;
					}
				}
			}

			&:not(.self) {
				.message {
					.arrow {
						border-left-color: transparent !important;
					}
				}
			}

			&.self {
				margin-top: @line-height-computed;
				.avatar {
					display: none;
				}
				.message-wrapper .message {
					border-left: none;
					border-right: 3px solid transparent;
					.arrow {
						left: 100%;
						right: auto;
						border-right-color: transparent !important;
					}
				}
			}
		}
	}

	.new-message {
		.full-size;
		top: auto;
		height: @new-message-height;
		background-color: @gray-lightest;
		padding: @line-height-computed / 4;
		border-top: 1px solid @toolbar-border-color;
		textarea {
			overflow: auto;
			resize: none;
			border-radius: @border-radius-base;
			border: 1px solid @toolbar-border-color;
			height: 100%;
			width: 100%;
			color: @gray-dark;
			font-size: 14px;
			padding: @line-height-computed / 4;
		}
	}
}

.break-word {
	word-break: break-all;
}

.editor-dark {
	.chat {
		.new-message {
			background-color: lighten(@editor-dark-background-color, 10%);
			border-color: @editor-dark-toolbar-border-color;
		}
	}
}