* {
  box-sizing: border-box;
}

.flex-wrapper {
  display: flex;
  flex-wrap: nowrap;
  justify-content: flex-end;
  text-align: center;
max-height:800px;
}

.left {
  margin-left: 10px;
  flex: 33.33%;
  max-width:500px;
}
.middle {margin-bottom: 0px;
max-width:500px;
flex:33.33%;}

.right {
  margin: 10px;
  flex: 33.33%;
  max-width:500px;
}