.sidebar {
    width: clamp(120px, 20vw, 300px);
    background-color: #fff; 
    color: #333;
    padding: 22px;
    position: fixed; 
    top: 0; 
    left: 0; 
    bottom: 0; 
    z-index: 1;
    margin: 0;
}
.sidebar h2 {
    font-size: 20px;
}
.sidebar ul {
    list-style-type: none;
    padding: 0;
}
.sidebar ul li {
    margin-bottom: 10px;
}
.sidebar a {
    font-size: 25px;
    text-decoration: none;
    color: #000;
}
.social-links {
    text-align: center;
    margin-top: 20px;
}
.social-link {
    text-decoration: none;
    color: #333;
    font-size: 20px;
    margin: 10px;
    display: inline-block;
}
.social-link img {
    width: 30px;
    height: 30px;
}
.sidebar li:hover .submenu {
    display: block;
    border: 1px solid #ccc;
}
.header-navigation .submenu {
    display: none;
    flex-direction: column;
    position: absolute;
    background-color: #fff;
    box-shadow: 0 1px 0px rgba(0, 0, 0, 0.00);
    z-index: 5;
    border: 1px solid #fff;
    border-radius: 10px;
}
.header-navigation li:hover .submenu {
    display: flex;
}