body, html{
  width: 100%;
  height: 100%;
  font-family: 'Gill Sans', 'Gill Sans MT', Calibri, 'Trebuchet MS', sans-serif;
  background: url("bg.jpg") no-repeat center center fixed;
  background-size: cover;
  -webkit-background-size: cover;
  -moz-background-size: cover;
  -o-background-size: cover;
}

.container{
  margin: 90px auto;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;

}
h3{
  margin: 90px auto;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;

}
.card{
  margin: 20px;
}