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.flex .flex-item.n1 width: 200px; .flex-item.n2 flex-basis: 200px; (height 200px in this case)
html, body height 100% .flex display flex background orange height 100% flex-direction column .flex-item font-size 22px color white padding 10px 30px .n1 background green width 200px .n2 background red flex-basis 200px
Also see: Tab Triggers