*,
*:before,
*:after {
  box-sizing: inherit;
}

.column {
  float: left;
  width: 33%;
  margin-bottom: 16px;
  padding: 0 8px;
}

.card {
  height: 100%;
  box-shadow: 0 4px 8px 0 rgba(0, 0, 0, 0.2);
}

.card img {
  -webkit-filter: grayscale(100%); /* Safari 6.0 - 9.0 */
  filter: grayscale(100%);
}

.card img:hover {
  -webkit-filter: grayscale(5%); /* Safari 6.0 - 9.0 */
  filter: grayscale(5%);
}

.container {
  padding: 0 16px;
  height: 100%;
}

.container::after,
.row::after {
  content: "";
  clear: both;
  display: table;
}

.title {
  color: grey;
}

.button {
  border: none;
  outline: 0;
  display: inline-block;
  padding: 8px;
  color: #fff;
  background-color: #559900;
  text-align: center;
  cursor: pointer;
  width: 60%;
}

.button:hover {
  color: #000;
  background-color: #b8ff5b;
}

@media screen and (max-width: 650px) {
  .column {
    width: 100%;
    display: block;
  }
  .card {
    width: 100%;
  }
}