div自适应高度自动填充剩余高度

方案1: Html: 头部DIV 下部DIV CSS: html, body { height: 100%; padding: 0; margin: 0; } .outer { height: 100%; padding: 100px 0 0; box-sizing: border-box ; position: relative; } .A { height: 100px; background: #BBE8F2; positi