html:
<div class="sj_down"></div> <div class="sj_up"></div> <div class="sj_left"></div> <div class="sj_right"></div>
css:
.sj_down{ width: 0; height: 0; border-width: 40px; border-style: solid; border-color: red transparent transparent transparent; } .sj_up{ width: 0; height: 0; border-width: 40px; border-style: solid; border-color: transparent transparent red transparent; } .sj_left{ width: 0; height: 0; border-width: 40px; border-style: solid; border-color: transparent red transparent transparent; } .sj_right{ width: 0; height: 0; border-width: 40px; border-style: solid; border-color: transparent transparent transparent red; }
效果如下:
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