focalboard/webapp/src/components/sidebar.scss

.Sidebar {
    flex: 0 0 230px;

	display: flex;
	flex-direction: column;

	min-height: 100%;
	color: rgb(var(--sidebar-fg));
	background-color: rgb(var(--sidebar-bg));
	padding: 10px 0;

    &.hidden {
        position: absolute;
        top: 0;
        left: 0;
        z-index: 15;
        min-height: 0;
        height: 50px;
        width: 50px;
        background: none;
        padding: 0;
        > div {
            padding: 0;
            margin: auto;
        }
    }

    .octo-sidebar-header {
        display: flex;
        flex-direction: row;

        font-weight: 600;
        padding: 3px 20px;
        margin-bottom: 5px;
        .show-button {
            .HamburgerIcon {
                display: block;
            }
            .ShowSidebarIcon {
                display: none;
            }
            &:hover {
                .HamburgerIcon {
                    display: none;
                }
                .ShowSidebarIcon {
                    display: block;
                }
            }
        }
    }

    .octo-sidebar-item {
        display: flex;
        flex-direction: row;

        font-weight: 500;
        padding: 3px 20px;
        &.subitem {
            color: rgba(var(--sidebar-fg), 0.6);
            font-weight: 400;
            margin-left: 20px;
        }
    }

    .octo-sidebar-title {
        cursor: pointer;
        flex-grow: 1;
    }

    .octo-sidebar-item {
        &:hover {
            background-color: rgba(var(--sidebar-fg), 0.05);
        }
        .octo-button {
            &:hover {
                background-color: rgba(var(--sidebar-fg), 0.1);
            }
        }
    }
}