body {
  background-image:url('images/bg.jpg');
   background-repeat: no-repeat;
  background-size: cover;



.flip-card {
  background-color: transparent;
  width: 300px;
  height: 300px;
  perspective: 1000px;
}

.flip-card-inner {
  position: relative;
  width: 100%;
  height: 100%;
  text-align: center;
  transition: transform 0.6s;
  transform-style: preserve-3d;
  box-shadow: 0 4px 8px 0 rgba(0,0,0,0.2);
}

.flip-card:hover .flip-card-inner {
  transform: rotateY(180deg);
}

.flip-card-front, .flip-card-back {
  position: absolute;
  width: 100%;
  height: 100%;
  -webkit-backface-visibility: hidden;
  backface-visibility: hidden;
}

.flip-card-front {
  background-color: #bbb;
  color: black;
}

.flip-card-back {
  background-color: #000000;
  color: white;
  transform: rotateY(180deg);
}


* {
  box-sizing: border-box;
}

body {
  margin: 10px;
  font-family: Arial;
}

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


.column {
  float: left;
  width: 40%;
  padding: 1px;
}

.column img {
  margin-top: 1px;
}

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