--边界边框
-----外边距：margin 上 top 右 left 下 bottom 左 right
-----内边距：padding 上 top 右 left 下 bottom 左 right
-----边框：border
----------------------------------透明 transparent
<!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title></title> <style type="text/css"> #first{ width: 200px; height: 200px; background-color: red; margin: 30px 40px 50px 60px; } #second{ width: 200px; height: 200px; background-color: red; } #third{ /* 200px;*/ width: 170px; height: 200px; background-color: orange; padding-left: 30px; } #forth{ width: 300px; height: 200px; /*border-right: 1px solid black;*/ border-top: 10px solid red; border-right: 10px solid red; } #fifth{ width: 0px; height: 0px; border-top: 100px solid red; border-left: 100px solid transparent; border-bottom: 100px solid transparent; border-right: 100px solid transparent; } #sixth{ width: 200px; height: 200px; background-color: red; transform: rotate(45deg); } </style> </head> <body> <div id="first"> </div> <div id="second"> </div> <div id="third"> </div> <div id="forth"> </div> <div id="fifth"> </div> <div id="sixth"> </div> </body> </html>
