overleaf/services/web/public/stylesheets/app/editor/file-tree.less

#file-tree {
	background-color: #fafafa;

	ul.file-tree-list {
		font-size: 0.8rem;
		margin: 0;
		padding: (@line-height-computed / 4) 0;
		position: absolute;
		top: 32px;
		bottom: 0;
		left: 0;
		right: 0;
		overflow-y: auto;

		ul {
			margin-left: (@line-height-computed / 2);
		}

		li {
			line-height: 2.6;

			.entity-name {
				color: @gray-dark;
				cursor: pointer;
				white-space: nowrap;
				overflow: hidden;
				text-overflow: ellipsis;
				&:hover {
					background-color: @gray-lightest;
				}
				input {
					line-height: 1.6;
				}
				&.droppable-hover {
					background-color: @file-tree-droppable-background-color;
				}
			}

			i.fa-folder-open, i.fa-folder {
				color: lighten(desaturate(@link-color, 10%), 5%);
				font-size: 14px;
			}

			i.fa-file, i.fa-image {
				color: @gray-light;
				font-size: 14px;
			}

			i.toggle {
				width: 24px;
				padding: 6px;
				font-size: 0.7rem;
				color: @gray
			}

			&.selected {
				> .entity > .entity-name {
					color: @link-color;
					border-right: 4px solid @link-color;
					font-weight: bold;
					i.fa-folder-open, i.fa-folder, i.fa-file, i.fa-image {
						color: @link-color;
					}
					padding-right: 32px;
				}
			}

			.dropdown {
				position: absolute;
				right: 0;
				> a {
					padding: 0 12px;
				}
			}
		}
	}

	ul.droppable-hover {
		background-color: @file-tree-droppable-background-color;
	}
}