.flex-container {
  padding: 0;
  margin: 0;
  list-style: none;
  -ms-box-orient: horizontal;
  display: -webkit-box;
  display: -moz-box;
  display: -ms-flexbox;
  display: -moz-flex;
  display: -webkit-flex;
  display: flex;
  justify-content: center;
}

.wrap    { 
  -webkit-flex-wrap: wrap;
  flex-wrap: wrap;
}  
.wrap li {
  background: transparent;
  display: block;
}

.flex-item {
  background: transparent;
  padding: 5px;
  width: 263px;
  height: 150px;
  margin: 10px;
  
  line-height: 100px;
  color: white;
  font-weight: bold;
  font-size: 2em;
  text-align: center;
}

.wrap li img {
  border: 0;
  border-radius: 20px;
}