.demo {
    width: 100%;
    margin: 0 auto;
    background: #f0f0f0;
    position: relative;
}
.demo ul {
    height: 32px;
    overflow: hidden;
}
.demo li {
    float: left;
    width: 48.2%;
    text-align: center;
    position: relative;
    z-index: 2;
    font-weight: bold;
    font-size: 14px;
    line-height: 32px;
}
.demo li em {
    position: absolute;
    right: -24px;
    top: -8px;
    width: 0;
    height: 0;
    line-height: 0;
    border-width: 24px 0 24px 24px;
    border-color: transparent transparent transparent #fff;
    border-style: dashed dashed dashed solid;
}
.sanjiao1{
    position: absolute;
    right: -16px;
    top: 0;
    width: 0;
    height: 0;
    line-height: 0;
    border-width: 16px 0 16px 16px;
    border-color: transparent transparent transparent #f0f0f0;
    border-style: dashed dashed dashed solid;
    z-index: 999;
}
.demo li.current {
    background: #c3d503;
    color: #fff;
    z-index: 1;
}/*绿色背景*/
.huangsanjiao{
    border-color: transparent transparent transparent #c3d503;
}
em{z-index: 0;}