Сергей Горячев

.home:hover {
  transform: scale(3);
  transform-origin: 0 0;
}

button {
    padding: 0;
    min-width: 160px;
    min-height: 50px;
    opacity: 1;
    white-space: nowrap;
    background: linear-gradient(to top, #121212 40%, #636363 70%, #a6a6a6 90%);
    border: 3px solid #4f4f4f;
    border-radius: 15px;
    margin: 0;
    /* добавить */
    display: flex;
    flex-direction: row;
    align-items: center;
    align-content: center;
    justify-content: center;
}

<div id="foo2">
  <img src="images/01.jpg" alt="">
  <img src="images/02.jpg" alt="">
  <img src="images/03.jpg" alt="">
  <img src="images/04.jpg" alt="">
  <img src="images/05.jpg" alt="">
 </div>

.col-md-3 {
  display: flex;
}
.element {
  border: 1px solid #333;
  padding: 15px;
  margin-bottom: 15px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

div {
  justify-content: center;
}
a {
  padding: 2px;
}