css如何出来空三角形,用CSS來畫空心三角形的方法

畫這里三角形的方法：

用CSS來實現：整個彈框的ID是#favoriteOptionMenus,對於#favoriteOptionMenus這個元素設置:before和:after的樣式，讓:before和:after的樣式偏移一個像素，就可以實現了

Html代碼為：

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對應實現三角形的CSS代碼為：

#favoriteOptionMenus {

padding: 15px 10px;

width: 450px;

}

#favoriteOptionMenus:before {

box-sizing: content-box;

width: 0px;

height: 0px;

position: absolute;

top: -24px;

left: 89px;

padding: 0;

border-bottom: 12px solid #FFFFFF;

border-top: 12px solid transparent;

border-left: 12px solid transparent;

border-right: 12px solid transparent;

display: block;

content: '';

z-index: 12;

}

#favoriteOptionMenus:after {

box-sizing: content-box;

width: 0px;

height: 0px;

position: absolute;

top: -26px;

left: 88px;

padding: 0;

border-bottom: 13px solid #9c9999;

border-top: 13px solid transparent;

border-left: 13px solid transparent;

border-right: 13px solid transparent;

display: block;

content: '';

z-index: 10;

}