1.块元素独占一列 #block1{background-color:#00FFFF} #block2{background-color:#7FFFD4} #block3{background-color:#FFFF00} div{ font-size:px; width:100px; height:100px; border:1px solid black; } 块1 块2 块3 效果: #block1{ background-color:#00FFFF; float:right;} #block2{backgr