If all items have flex class, the remaining space in the container will be distributed equally to all children. If one of the children has a value of 2, the remaining space would take up twice as much space as the others (or it will try to, at least).
<div class="container"> <div class="flex"> ... </div> </div>
<div class="container"> <div class="flex"> ... </div> <div class="flex2"> ... </div> </div>
<div class="container"> <div class="flex"> ... </div> <div class="flex2"> ... </div> <div class="flex3"> ... </div> </div>
<div class="container"> <div class="flex"> ... </div> <div class="flex"> ... </div> </div>
<div class="container"> <div class="flex"> ... </div> <div class="flex"> ... </div> <div class="flex"> ... </div> </div>
<div class="container"> <div class="flex"> ... </div> <div class="flex"> ... </div> <div class="flex"> ... </div> <div class="flex"> ... </div> </div>
<div class="container"> <div class="flex"> ... </div> <div class="flex"> ... </div> <div class="flex"> ... </div> <div class="flex"> ... </div> <div class="flex"> ... </div> </div>
<div class="container"> <div class="basis1"> ... </div> <div class="flex"> ... </div> </div>
<div class="container"> <div class="basis1"> ... </div> <div class="basis1"> ... </div> <div class="basis1 flex"> ... </div> </div>
<div class="container"> <div class="basis1"> ... </div> <div class="basis1"> ... </div> <div class="basis1"> ... </div> <div class="basis1 flex"> ... </div> </div>
<div class="container"> <div class="basis1"> ... </div> <div class="basis1"> ... </div> <div class="basis1"> ... </div> <div class="basis1"> ... </div> <div class="basis1 flex"> ... </div> </div>
<div class="container"> <div class="basis1"> ... </div> <div class="basis1"> ... </div> <div class="basis1"> ... </div> <div class="basis1"> ... </div> <div class="basis1"> ... </div> <div class="basis1 flex"> ... </div> </div>
<div class="container"> <div class="basis1"> ... </div> <div class="basis1"> ... </div> <div class="basis1"> ... </div> <div class="basis1"> ... </div> <div class="basis1"> ... </div> <div class="basis1"> ... </div> <div class="basis1 flex"> ... </div> </div>
<div class="container"> <div class="basis1"> ... </div> <div class="basis1"> ... </div> <div class="basis1"> ... </div> <div class="basis1"> ... </div> <div class="basis1"> ... </div> <div class="basis1"> ... </div> <div class="basis1"> ... </div> <div class="basis1 flex"> ... </div> </div>
<div class="container"> <div class="basis1"> ... </div> <div class="basis1"> ... </div> <div class="basis1"> ... </div> <div class="basis1"> ... </div> <div class="basis1"> ... </div> <div class="basis1"> ... </div> <div class="basis1"> ... </div> <div class="basis1"> ... </div> <div class="basis1 flex"> ... </div> </div>
<div class="container"> <div class="basis1"> ... </div> <div class="basis1"> ... </div> <div class="basis1"> ... </div> <div class="basis1"> ... </div> <div class="basis1"> ... </div> <div class="basis1"> ... </div> <div class="basis1"> ... </div> <div class="basis1"> ... </div> <div class="basis1"> ... </div> <div class="basis1 flex"> ... </div> </div>