client/src/components/SideBar/SideBar.css

.side_bar {
    background-color: var(--PRIMARY-COLOR);
    color: white;
    width: 300px;

    display: flex;
    flex-direction: column;
    align-items: center;

    flex-shrink: 0;
    /* overflow-y: scroll; */
    height: 100vh;
}