*{
    margin: 0px;
    padding: 0px;
    box-sizing: border-box;
}
.middle{
    max-width: 1200px;
    margin: 0px auto;
}
.flex{
    display: flex;
}
.flex-center-row{
    display: flex;
    justify-content: center;
    align-items: center;
}
.flex-center-column{
    display: flex;
    justify-content: center;
    align-items: center;
    flex-direction: column;
    background-color: green;
}
.flex-space-between-row{
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-direction: column;
    background-color: green;
} 
.flex-space-evenly-row{
    display: flex;  
    justify-content: space-evenly;
    align-items: center;
    flex-direction: column;
    background-color: green;
}