flexionar un ancho completo
.flexContainer {
height: 100vh;
display: flex;
flex-wrap: wrap;
}
.item:first-child {
flex: 1 1 100%;
margin-bottom: 20px;
}
.item {
flex: 1 1 40%;
height: 50px;
background-color: red;
margin: 0 20px;
}
Green Team