.triangle-left { width: 0; height: 0; border-top: 27px solid transparent; border-right: 27px solid #F9F9F9; border-bottom: 27px solid transparent; /兼容ie6 透明效果/ _border-top-color:#f35255; _border-bottom-color:#f35255; _filter:chroma(color=#f35255); /兼容ie6 div-height的bug/ overflow:hidden; }