#header-container {
    position: sticky;
    top: 0;
    left: 0;
    width: 100%;
    background-color: #e0e0e0;
    z-index: 1000;
    display: flex;
}

#header-left {
    padding-top: 20px;
    padding-bottom: 20px;
    padding-left: 25px;
}

#header-right {
    /* padding-top: 20px;
    padding-bottom: 20px; */
    padding-right: 25px;
    display: flex;
}

a.upper-left-btn {
    padding: 10px;
    font-size: 16px;
    text-decoration: none;
    color: #000;
    cursor: pointer;
}

.upper-right-btn {
    position: relative;
    padding-top: 20px;
    padding-bottom: 20px;
}

.upper-right-btn a {
    padding: 10px;
    font-size: 16px;
    text-decoration: none;
    color: #000;
    cursor: pointer;
}


.dropdown {
    display: none;
    position: absolute;
    top: 90%;
    right: 0;
    background-color: #ffffff;
    border-radius: 5px;
    /* margin-top: 15px; */
    box-shadow: 0 15px 20px rgba(0, 0, 0, 0.2);
}

.upper-right-btn:hover .dropdown {
    display: block;
}

.dropdown div {
    display: block;
    width: 120px;
    padding: 10px 15px 10px 15px;
    border-radius: 5px;
    display: flex;
    align-items: center;
    cursor: pointer;
}

.dropdown div img {
    width: 16px;
    margin-left: 5px;
}

.dropdown div span {
    color: black;
    text-decoration: none;
    padding: 0px 0px 1px 12px;
    font-size: 14px;
}

.dropdown div:hover {
    background-color: #f0f0f0;
}


#copyright {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    text-align: center;
    padding-bottom: 20px;
    padding-top: 20px;
    font-size: 16px;
    color: #666;
    background-color: #ffffff;
    z-index: 1000;
}