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HTML/CSSIntermediate#css#flexbox
Flexbox lays out children in one dimension. The main axis is set by flex-direction (row = horizontal, column = vertical); justify-content aligns items along it. The cross axis is perpendicular; align-items and align-content control alignment along it.
display: flex; flex-direction: row; justify-content: space-between; /* main axis */ align-items: center; /* cross axis */