.flex-container {
    width: 100%;
    height: 100%;
    padding: 2 rem;
    margin: 0;
    list-style: none;
    background:#444;
    display: flex;
    flex-direction: row;
    flex-wrap: wrap;
    flex: 1 1 0%;
    justify-content: space-around;
}

.flex-item {
  color:white;
  padding: 30px;
  height:100%;
}

#box1 {
  	flex:1;
}
#box2 {
  	flex:1;
}
#box3 {
  	flex:1;
}
#boxBottom {
  width:100%;
  padding: 0;
  height: 200px;
}