[CSS3] 各种角度的三角形绘制

#triangle-up {
    width:;
    height:;
    border-left: 50px solid transparent;
    border-right: 50px solid transparent;
    border-bottom: 100px solid red;
}

#triangle-down {
    width:;
    height:;
    border-left: 50px solid transparent;
    border-right: 50px solid transparent;
    border-top: 100px solid red;
}

#triangle-left {
    width:;
    height:;
    border-top: 50px solid transparent;
    border-right: 100px solid red;
    border-bottom: 50px solid transparent;
}

#triangle-right {
    width:;
    height:;
    border-top: 50px solid transparent;
    border-left: 100px solid red;
    border-bottom: 50px solid transparent;
}

#triangle-topleft {
    width:;
    height:;
    border-top: 100px solid red;
    border-right: 100px solid transparent;
}

#triangle-topright {
    width:;
    height:;
    border-top: 100px solid red;
    border-left: 100px solid transparent;
}

#triangle-bottomleft {
    width:;
    height:;
    border-bottom: 100px solid red;
    border-right: 100px solid transparent;
}

#triangle-bottomright {
    width:;
    height:;
    border-bottom: 100px solid red;
    border-left: 100px solid transparent;
}