width:100%; margin:0 auto; padding:0.6rem 0.6rem; background-color:#ddeeff; height:2rem;
TOP
ulにflex-box
calc(100% / 6)
liの中に別途
ul liを入れ
子要素ができる
CONTENTS03
CHILD01
CHILD02
CHILD03
CHILD04
CHILD05
CONTENTS04
CHILD01
CHILD02
CHILD03
CONTENTS05
CHILD01
CHILD02
Fla-Fra-Fea