* {
    box-sizing: border-box;
}



.header {
    text-align: center;
    padding: 32px;
}

.row {
    display: -ms-flexbox; /* IE10 */
    display: flex;
    -ms-flex-wrap: wrap; /* IE10 */
    flex-wrap: wrap;
    padding: 0 4px;
}

/* Create four equal columns that sits next to each other */
.column {
    -ms-flex: 33%; /* IE10 */
    flex: 33%;
    max-width: 33%;
    padding: 0 4px;
}

    .column img {
        margin-top: 8px;
        vertical-align: middle;
    }

/* Responsive layout - makes a two column-layout instead of four columns */
@media screen and (max-width: 800px) {
    .column {
        -ms-flex: 50%;
        flex: 50%;
        max-width: 50%;
    }
}

/* Responsive layout - makes the two columns stack on top of each other instead of next to each other */
@media screen and (max-width: 600px) {
    .column {
        -ms-flex: 100%;
        flex: 100%;
        max-width: 100%;
    }
}

.container {
    position: relative;
   
}

.image {
    display: block;
    width: 80%;
    height: auto;
}

.overlay {
    position: absolute;
    bottom: 0;
    background: rgb(0, 0, 0);
    background: rgba(0, 0, 0, 0.5); /* Black see-through */
    color: #f1f1f1;
    width: 80%;
    transition: .5s ease;
    opacity: 0;
    color: white;
    font-size: 20px;
    padding: 20px;
    text-align: center;
}

.container:hover .overlay {
    opacity: 1;
}
.BtnIr {
  background-color: white;
  color: black;
  border: 1px solid #555555;
}

.BtnIr:hover {
  background-color: #555555;
  color: white;
}

.btn {
  background-color: white; /* Green */
  border: none;
  color: black;
  padding: 8px 16px;
  text-align: center;
  text-decoration: none;
  display: inline-block;
  font-size: 12px;
  margin: 4px 2px;
  -webkit-transition-duration: 0.4s; /* Safari */
  transition-duration: 0.4s;
  cursor: pointer;
}