O float é uma propriedade meio imprevisível no CSS. Este é um tutorial explicando passo-a-passo o seu funcionamento com alguns macetes que você não encontrará em nenhum site de referência CSS.
Começamos fazendo um HTML com 3 Div’s.
<div class="wrapper"><div class="nav">Menu</div><div class="main">Conteúdo</div></div>
O float é uma propriedade que faz o objeto flutuar à esquerda ou à direita do restante do conteúdo. Se quisermos o menu à esquerda e o conteúdo à direita, o que geralmente fazem é:
.nav{float:left;width:30%;}.main{float:right;width:90%;}
Porém, isso vai lhe causar certas dores de cabeça mais para frente no desenvolvimento do site.
Pode notar que a div ‘wrapper’ não está acompanhando a altura das div ‘nav’ e ‘main’. Para fazer com que a div ‘wrapper’ acompanhe a altura do conteúdo dentro dela, simplesmente adicionamos uma nova div com o seguinte CSS:
.clear{clear:both;display:block;overflow:hidden;visibility:hidden;width:0;height:0;}
Quem já encontrou este problema sabe o quanto é irritante. Em alguns casos, as colunas não ficam uma do lado da outra NUNCA, por mais que você tente.
Para corrigir isso devemos usar o float da maneira correta. Ao invés de colocar ‘float:left;’ no da esquerda e ‘float:right;’ no da direita, colocamos apenas no da esquerda e deixamos o da direita alinhar naturalmente com um espaço de margem.
.nav{float:left;width:30%;}.main{margin-left:35%;/* um pouco a mais para dar um espaço entre eles*/}
Agora o código completo:
<!--HTML--><div class="wrapper"><div class="nav">Menu</div><div class="main">Conteúdo</div><div class="clear"></div></div><!--CSS-->rel="stylesheet" type="text/css">.wrapper{display:block;}.nav{float:left;width:30%;}.main{margin-left:35%;/* um pouco a mais para dar um espaço entre eles*/}.clear{clear:both;display:block;overflow:hidden;visibility:hidden;width:0;height:0;}
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