header {
    background-color: #f8f9fa; /* Light grey background */
    padding: 10px 0;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1); /* Soft shadow */
    border-bottom: 3px solid #fff; /* Optional border for contrast */
}

.header-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

.logo img {
    height: 70px; /* Adjust size as needed */
    max-width: 100%;
}

.portal-name h1 {
    font-size: 28px;
    color: #007bff; /* Same as border color for consistency */
    margin: 0;
    text-transform: uppercase;
    font-weight: bold;
    letter-spacing: 2px;
}

.sidenav {

    height: 100%;
    width: 0;
    position: fixed;
    z-index: 9;
    top: 0;
    right: 0;
    background-color: #f7f7f7;
    overflow-x: hidden;
    transition: 0.5s;
    padding-top: 5px;
    box-shadow: 1px 5px 8px;
  }
  
  .sidenav a {
    padding: 8px 8px 8px 32px;
    text-decoration: none;
    font-size: 25px;
  
    color: #818181;
    display: block;
    transition: 0.3s;
  }
  
  .sidenav a:hover {
    color: red;
  }
  
  .sidenav .closebtn {
    position: absolute;
    top: 35px;
   left: 10px;
    font-size: 20px;

    
  }
  
  #main-btn {
    transition: margin-left .5s;
    padding: 16px;
  }
  
  @media screen and (max-height: 450px) {
    .sidenav {padding-top: 15px;}
    .sidenav a {font-size: 18px;}
  }


@media (max-width: 768px) {
    .header-container {
        flex-direction: column;
        text-align: center;
      
    }
    
    .logo img {
        height: 60px;
    }
    
    .portal-name h1 {
        font-size: 24px;
    }
    #main-btn {display:none;}
}