html5右侧边框标签,用CSS样式写选择框右侧小三角

直接上代码！

小三角

.up-triangle{

width:0px;

height:0px;

border-bottom:30px solid #000;

border-left:15px solid transparent;

border-right:15px solid transparent;

margin:100px auto;

}

.down-triangle{

width:0px;

height:0px;

border-top:30px solid #000;

border-left:15px solid transparent;

border-right:15px solid transparent;

margin:100px auto;

}

.left-triangle{

width:0px;

height:0px;

border-right:30px solid #000;

border-top:15px solid transparent;

border-bottom:15px solid transparent;

margin:100px auto;

}

.right-triangle{

width:0px;

height:0px;

border-left:30px solid #000;

border-top:15px solid transparent;

border-bottom:15px solid transparent;

margin:100px auto;

}

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