Bootstrap

• col-xs-* : < 768px
• col-sm-* : >= 768px
• col-md-* : >= 992px
• col-lg-* : >= 1200 px

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offset

			<div class="col-lg-2 col-lg-offset-1">lg : 2 colonnes</div>
			<div class="col-lg-4 col-lg-offset-2">lg : 4 colonnes</div>
			<div class="col-lg-2 col-lg-offset-1">lg : 2 colonnes</div>
		

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Imbrication de lignes

			<div class="col-lg-8">8 colonnes
				<div class="row">
					<div class="col-lg-3">3 colonnes</div>
					<div class="col-lg-6">6 colonnes</div>
					<div class="col-lg-3">3 colonnes</div>
				</div>
			</div>