CSS代码：
.icon-arrow-down {
width: 20px; height: 20px;
background: url(data:image/svg+xml,%3Csvg%20version%3D%221.1%22%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20width%3D%22200%22%20height%3D%22200%22%20viewBox%3D%220%200%20200%20200%22%3E%3Cpath%20fill%3D%22%2300A5E0%22%20d%3D%22M145.659%2C68.949c-5.101-5.208-13.372-5.208-18.473%2C0L99.479%2C97.233%20L71.772%2C68.949c-5.1-5.208-13.371-5.208-18.473%2C0c-5.099%2C5.208-5.099%2C13.648%2C0%2C18.857l46.18%2C47.14l46.181-47.14%20C150.759%2C82.598%2C150.759%2C74.157%2C145.659%2C68.949z%22%2F%3E%3C%2Fsvg%3E) no-repeat center;
background-size: 100%;
}
HTML代码：
<div class="icon-arrow-down"></div>
