.flex-container {
  display: flex;
  flex-direction: row;
  align-items: stretch;
  align-content: space-around;
  list-style:none;
  flex-wrap: wrap;
}
.flex-container li{
  flex:auto;
  flex-basis: 25%;
  border: 2px solid rgb(109,220,209);
  background:rgb(255,255,255);
  padding: 10px;
  transition: .3s ease;
  -moz-transition: .3s ease;
  -webkit-transition: .3s ease;
  -o-transition: .3s ease;
}