#wrapper {
    display: flex;
    width: 100%;
}

#sidebar-wrapper {
    position: fixed;
    top: 0;
    left: 0;
    height: 100vh;
    min-width: 250px;
    max-width: 250px;
    background-color: #343a40;
    overflow-y: auto;
    z-index: 1000;
    transition: all 0.3s ease;
}

#page-content-wrapper {
    margin-left: 250px;
    width: calc(100% - 250px);
    padding: 20px;
    transition: all 0.3s ease;
}

#wrapper.toggled #sidebar-wrapper {
    margin-left: -250px;
}

#wrapper.toggled #page-content-wrapper {
    margin-left: 0;
    width: 100%;
}

/* Auto-collapse sidebar on small screens */
@media (max-width: 768px) {
    #wrapper {
        flex-direction: column;
    }

    #sidebar-wrapper {
        margin-left: -250px;
    }

    #wrapper.toggled #sidebar-wrapper {
        margin-left: 0;
    }

    #page-content-wrapper {
        margin-left: 0;
        width: 100%;
    }
}

body {
    margin: 0;
    padding: 0;
    display: flex;
    min-height: 100vh;
    font-family: Arial, sans-serif;
}

/* Sidebar */
.sidebar {
    width: 250px;
    background-color: #343a40;
    color: #fff;
    height: 100vh;
    transition: width 0.3s ease;
    overflow: hidden;
    position: fixed;
}

.sidebar.collapsed {
    width: 60px;
}

.sidebar .toggle-btn {
    background-color: #212529;
    border: none;
    color: white;
    padding: 10px;
    cursor: pointer;
    width: 100%;
    text-align: left;
}

.nav-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.nav-list li {
    padding: 15px;
    text-align: left;
}

.nav-list li a {
    color: white;
    text-decoration: none;
    display: block;
}

.nav-list li a:hover {
    background-color: #495057;
}

/* Content */
.main-content {
    margin-left: 250px;
    padding: 20px;
    flex-grow: 1;
    transition: margin-left 0.3s ease;
}

.sidebar.collapsed~.main-content {
    margin-left: 60px;
}

body.overlay-opened {
    overflow: hidden;
}

.overlay {
    height: 0%;
    width: 100%;
    position: fixed;
    z-index: 10;
    top: 0;
    left: 0;
    background-color: rgb(0, 0, 0);
    background-color: rgba(0, 0, 0, 0.9);
    overflow-y: hidden;
    transition: 0.5s;
}

.overlay-content {
    position: relative;
    top: 25%;
    width: 100%;
    text-align: center;
    margin-top: 30px;
}

.overlay a {
    padding: 8px;
    text-decoration: none;
    font-size: 36px;
    color: #818181;
    display: block;
    transition: 0.3s;
}

.overlay a:hover,
.overlay a:focus {
    color: #f1f1f1;
}

#openBtn {
    position: fixed;
    top: 15px;
    left: 15px;
    z-index: 2;
    font-size: 30px;
    cursor: pointer;
    color: white;
}

.overlay .closebtn {
    position: absolute;
    top: 20px;
    right: 45px;
    font-size: 60px;
}

@media screen and (max-height: 450px) {
    .overlay {
        overflow-y: auto;
    }

    .overlay a {
        font-size: 20px
    }

    .overlay .closebtn {
        font-size: 40px;
        top: 15px;
        right: 35px;
    }
}