摘要：
1 /* create an arrow that points up */ 2 div.arrow-up { 3 width:0px; 4 height:0px; 5 border-left:5px solid transparent; /* left arrow slant */ 6 border-right:5px solid transparent; /* right arrow slant */ 7 border-bottom:5px solid #2f2f2f; /* bottom, add background color here */ 8 fo... 阅读全文
