代码：
document .select_text{ width:30%; height: 20px; padding: 8px; border-radius: 5px; color: grey; } .select_text:focus{ border-color: green; box-shadow: 0px 0 5px grey; } .select_span{ position: relative; left: -2%; cursor: pointer; } .select_ul{ display: none; width: 27%; padding: 25px; margin: 0; height: 25vh; border: 1px solid grey; overflow: auto; } .select_li:hover{ background: green; }