.prof_container {
    display: flex;
    margin-top: 5%;
    margin-left: 10%;
    margin-right: 10%;
    margin-bottom: 5%;
}


img {
  width: 75%;
  height: auto%;
  margin-bottom: 20px;
box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}


.left-column {
    width: 30%;
    border-right: 1px solid #ccc;
    margin-right: 40px;
}


.right-column {
    width: 70%;
    margin-right: 20px;
}




.left-column p {
   width: 90%;
   line-height: 1.6;
}


.left-column h1 {
    margin-right: 20px;
    margin-bottom: 10px;
    color: #333;
}


.right-column h2 {
    margin-top: 10px;
    margin-bottom: 10px;
    color: #333;
}


ul {
    list-style: none;
    padding: 0;
}


li {
    padding: 5px 0;
}


a {
    color: #0056b3;
}







#activityList1 li:nth-child(n+4), #activityList2 li:nth-child(n+4), #activityList3 li:nth-child(n+4), #activityList4 li:nth-child(n+4), #activityList5 li:nth-child(n+4) {
  display: none;
}


.collapsible {
  text-align: center;
  text-decoration: none;
  display: inline-block;
  padding-left: 5px;
  padding-right: 5px;
  font-size: 14px;
  margin: 4px 2px;
  cursor: pointer;
 
}






@media (max-width: 768px) {

.prof_container {
    display: flex;
    flex-direction: column;
    justify-content: center; /* ¼¼·Î ¹æÇâÀ¸·Î Áß¾Ó Á¤·Ä */
    align-items: center; /* °¡·Î ¹æÇâÀ¸·Î Áß¾Ó Á¤·Ä */
    margin-bottom: 10%;
    margin-top: 10%;
}


img {
  width: 100%;
  height: auto%;
}


.left-column {
    width: 100%;
    border-right: 0px solid #ccc;
    margin-bottom: 20px;
    margin-left: 0;
    margin-right: 0;
}


.right-column {
    width: 100%;
    margin-left: 0;
    margin-right: 0;
}


.left-column h1 {
    margin-right: 0;
    margin-bottom: 10px;
}




}