div.i_gallery {
  border: 1px solid #ccc;
}

div.i_gallery:hover {
  border: 1px solid #777;
}

div.i_gallery img {
  width: 100%;
  height: auto;
}

div.i_desc {
  padding: 15px;
  text-align: center;
}

* {
  box-sizing: border-box;
}

.i_responsive {
  padding: 0 6px;
  
  width: 100%;
}

@media only screen and (max-width: 700px) {
  .i_responsive {
    width: 100.99999%;
    margin: 6px 0;
  }
}

@media only screen and (max-width: 500px) {
  .i_responsive {
    width: 100%;
  }
}

.i_clearfix:after {
  content: "";
  display: table;
  clear: both;
}