border制作三角形
.arrow-up {
width: 0;
height: 0;
border-left: 5px solid transparent;
border-right: 5px solid transparent;
border-bottom: 5px solid black;
}
.arrow-down {
width: 0;
height: 0;
border-left: 20px solid transparent;
border-right: 20px solid transparent;
border-top: 20px solid #f00;
}
.arrow-left {
width: 0;
height: 0;
border-top: 10px solid transparent;
border-bottom: 10px solid transparent;
border-right:10px solid blue;
}
.arrow-right {
width: 0;
height: 0;
border-top: 30px solid transparent;
border-bottom: 30px solid transparent;
border-left: 30px solid green;
}
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