/* Reset margin and padding */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

/* Fixed header styling */
.fixed {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background-color: #ffffff;
  }

.top-bar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px 20px;
    background-color: #333;
    color: #fff;
}

.issn {
    font-size: 14px;
    color: #ddd;
}

.navigation ul {
    list-style: none;
    display: flex;
    gap: 15px;
}

.logoj {
    margin-top: 90px;
    margin-bottom: 10px;
    font-size: 20px;
    font-weight: bold;
    color:  #123c5a;
    text-align: center;
    flex-grow: 1;
}

.navigation a {
    color: #fff;
    text-decoration: none;
    font-weight: bold;
    transition: color 0.3s ease;
    font-size: 14px;
    font-weight: 400;
}

.navigation a:hover {
    color: #ff9800;
}