.nav_link{
   font-size: 15px;
    position: relative;
    transition: all 0.4s;
}

.nav_link:hover{
    color: darkgreen;
}
.nav_link:after{
    content: '';
    height: 4px;
    width: 100%; /* Start with zero width */
    background: rgb(0,183,255);
    display: block;
    position: absolute;
    left: 0;
    bottom: -20px;
    opacity: 0;
    transition: all 0.2s;
    pointer-events: none;
   
}
.dropdown:hover .nav_link:after,
.nav_link.active:after {
  
    opacity: 1;
}
  
  
  .dropdown-content {
    display: none;
    position: absolute;
    top: 46px;
    left: 50%;
    transform: translateX(-50%);
    background-color: #f1f1f1;
    min-width: 160px;
    box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.2);
    z-index: 1;
    transition: all 0.3s ease-out; 
  }
  
  .dropdown-content.open {
    display: block;
}
  

  
  .dropdown:hover .dropdown-content {
    display: block;
}
  
.column-container{
    width: 800px;
    margin: 0 auto;
   
    padding: 20px;
    
}
.dropdown-content ul {
  display: flex;
  flex-direction: column; /* Display list items vertically */
  padding: 0; /* Remove default padding */
}

.dropdown-content ul li {
  list-style-type: none; /* Remove default list style */
}