div.gallery: 
{  
    width: 100%;}
div.gallery img {  width: 100%;  height: auto;}
.responsive {  padding: 20 20px;  float: left;  width: 33.3333333%;}
@media only screen and (max-width: 1200px) {  .responsive {    width: 49.99999999%;    margin: 20px 0;  }}
@media only screen and (max-width: 700px) {  .responsive {    width: 100%;  }}
.clearfix:after {  content: "";  display: table;  clear: both;}

div.gallery2: 
{  
    width: 100%;}
div.gallery2 img {  width: 100%;  height: auto;}
.responsive2 {  padding: 20 20px;  float: left;  width: 49.9999999%;}
@media only screen and (max-width: 1000px) {  .responsive2 {    width: 100%;    margin: 20px 0;  }}
.clearfix:after {  content: "";  display: table;  clear: both;}

div.gallery4: 
{ 
    width: 100%;}
div.gallery4 img {  width: 100%;  height: auto;}
.responsive4 {  padding: 20 20px;  float: left;  width: 24.9999999%;}
@media only screen and (max-width: 1000px) {  .responsive4 {    width: 49.9999999%;    margin: 20px 0;  }}
@media only screen and (max-width: 700px) {  .responsive {    width: 100%;  }}
.clearfix:after {  content: "";  display: table;  clear: both;}
.dropdown {
      position: relative;
      display: inline-block;
    }

    .dropdown-button {
      background-color: #333;
      color: white;
      padding: 10px 20px;
      font-size: 16px;
      border: none;
      cursor: pointer;
    }

    .dropdown-content {
      display: none;
      position: absolute;
      background-color: #f9f9f9;
      min-width: 220px;
      box-shadow: 0px 8px 16px rgba(0,0,0,0.2);
      z-index: 1;
    }

    .dropdown-content a {
      color: black;
      padding: 10px 16px;
      text-decoration: none;
      display: block;
    }

    .dropdown-content a:hover {
      background-color: #f1f1f1;
    }

    .dropdown:hover .dropdown-content {
      display: block;
    }

    .dropdown:hover .dropdown-button {
      background-color: #555;
    }

    .dropdown-group {
      padding: 8px;
      font-weight: bold;
      background-color: #eee;
    }