CSS代码：
.icon-arrow-down {
width: 20px; height: 20px;
background: url("data:image/svg+xml,%3Csvg version='1.1' xmlns='http://www.w3.org/2000/svg' width='200' height='200' viewBox='0 0 200 200'%3E%3Cpath fill='%2300A5E0' d='M145.659,68.949c-5.101-5.208-13.372-5.208-18.473,0L99.479,97.233 L71.772,68.949c-5.1-5.208-13.371-5.208-18.473,0c-5.099,5.208-5.099,13.648,0,18.857l46.18,47.14l46.181-47.14 C150.759,82.598,150.759,74.157,145.659,68.949z'/%3E%3C/svg%3E") no-repeat center;
background-size: 100%;
}
HTML代码：
<div class="icon-arrow-down"></div>
