.sidebar {
    height: 100vh;
    width: 13rem;
    position: fixed;
    top: 0;
    left: 0;
    background-color: #343a40;
    padding: 15px;
    transition: transform 0.3s ease;
    z-index: 99;
}
.sidebar.collapsed {
    transform: translateX(-100%);
}
.sidebar a {
    color: #ffffff;
    text-decoration: none;
    display: block;
    padding: 10px;
    margin: 5px 0;
    border-radius: 5px;
}
.sidebar a:hover {
    background-color: #495057;
}
.main-content {
    margin-left: 250px;
    padding: 20px;
    transition: margin-left 0.3s ease;
}
.main-content.expanded {
    margin-left: 0;
}