body {
    overflow-y: auto;
}
.content {
    flex: 1;
    padding: 20px;
}
.container {
    display: flex;
    flex-direction: column;
    max-width: 1200px;
    margin: 10px auto;
}
.question-card {
    background-color: #fff;
    padding: 30px;
    margin-bottom: 30px;
    border-radius: 40px;
    border: solid;
    transform: translateY(5px);
}
.question-card:hover {
    transform: translateY(0px);
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.2);
    border-radius: 30px;
    border: solid #f0f0f0;
    background-color: #f0f0f0;
    transition: transform 0.5s, box-shadow 0.2s;
}
.question-text {
    font-size: 1.1rem;
    margin-bottom: 20px;
    line-height: 1.6;
}
.question-text a {
    font-size: .9rem;
}
.alternatives {
    display: flex;
    flex-direction: column;
    gap: 15px;
}
.alternative {
    padding: 15px;
    border: 2px solid #ddd;
    border-radius: 10px;
    cursor: pointer;
    transition: background-color 0.3s;
}
.alternative:hover {
    background-color: #f5f5f5;
}
.correct {
    background-color: #90EE90 !important;
    border-color: #008000;
}
.incorrect {
    background-color: #FFB6C1 !important;
    border-color: #FF0000;
}
.sidebar {
    background: black;
    border-top-left-radius: none;
    border-top-right-radius: 30px;
    border-bottom-left-radius: 30px;
    border-bottom-right-radius: 30px;
    width: 200px;
    padding: 20px;
    transition: width 0.3s ease;
    position: fixed;
    top: 0;
    left: 0;
    height: 100vh;
    overflow-y: auto;
    z-index: 9998;
}
.content {
    flex: 1;
    padding: 20px;
    margin-left: 250px;
    position: relative;
    z-index: 1;
}
.sidebar .dropdown {
    position: relative;
}
.sidebar .dropdown-content {
    position: fixed;
    left: 220px;
    background-color: #555;
    min-width: 210px;
    border-top-left-radius: 1px;
    border-top-right-radius: 30px;
    border-bottom-left-radius: 30px;
    border-bottom-right-radius: 30px;
    padding: 10px 20px;
    box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.2);
    display: none;
    z-index: 9999;
}
.sidebar .dropdown:hover .dropdown-content {
    display: block;
    top: var(--dropdown-top, 0);
}
.sidebar ul li {
    position: relative;
}
.sidebar .dropdown-content a {
    background-color: #555;
    color: #fff;
    padding: 10px;
    border: none;
    display: block;
    text-decoration: none;
    white-space: nowrap;
}
.sidebar .dropdown-content a:hover {
    background-color: #777;
}
.question-card, .column {
    position: relative;
    z-index: 1;
}
.button-container {
    z-index: 999;
    transition: opacity 0.3s ease;
}
.button-container.hidden {
    opacity: 0;
    pointer-events: none;
}
@media screen and (max-width: 768px) {
    .sidebar {
        display: none;
    }   
    .content {
        margin-left: 0;
    }
}
.sidebar::-webkit-scrollbar {
    width: 6px;
}
.sidebar::-webkit-scrollbar-track {
    background: transparent;
}
.sidebar::-webkit-scrollbar-thumb {
    background: #555;
    border-radius: 3px;
}
.sidebar::-webkit-scrollbar-thumb:hover {
    background: #777;
}
.subject, .subject-dropdown, .module-dropdown, .chapter-dropdown, .page {
    position: relative;
    display: inline-block;
    margin-bottom: 20px;
    z-index: 100;
}
.subject-dropdown-content, .module-dropdown-content, .chapter-dropdown-content {
    display: none;
    position: absolute;
    background-color: #555;
    min-width: 100%;
    z-index: 1000;
    box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.2);
    border-top-left-radius: 1px;
    border-top-right-radius: 30px;
    border-bottom-left-radius: 30px;
    border-bottom-right-radius: 1px;
    overflow: hidden;
}
.container {
    position: relative;
    z-index: 50;
}
.question-card {
    position: relative;
    z-index: 50;
}
.content {
    position: relative;
    z-index: 90;
}
.subject-dropdown{
    z-index: 104;
}
.module-dropdown {
    z-index: 103;
}
.chapter-dropdown {
    z-index: 102;
}
.page {
    z-index: 101;
}