div.gym-wrapper {
  display:flex;
  flex-wrap:wrap;
  justify-content:space-around;
  align-items:stretch;
}
div.gym-box {
  margin: 20px 20px 20px 0px;
  padding: 10px 20px;
  width: 30%;
  min-width: 150px;
  text-align:center;
}