demo-HC-下拉菜单

下拉菜单：点击出现下拉列表（未实现js交互）

1.点击按钮+小三角图标
2.下拉列表

html:

    <div>
        <button>
            菜单
            <span class="icon-triangle"></span>
        </button>
        <ul>
            <li><a href="#">首页</a></li>
            <li><a href="#">个人中心</a></li>
        </ul>
    </div>

css:

button{
    padding: 6px 11px;
    background-color: #fff;
    font-weight: 400;
    font-size: 14px;
    line-height: 1.2;
    text-align: center;
    user-select: none;
    cursor: pointer;
    border:1px solid #ccc;
    border-radius: 4px;
}
/*倒三角*/
.icon-triangle{
    display: inline-block;
    vertical-align: middle;
    width: 0;
    height: 0;
    border-top: 4px solid #ccc;
    border-right: 4px solid transparent;
    border-left: 4px solid transparent;
}
ul{
    position: absolute;
    margin-top: 2px;
    text-align: left;
    border:1px solid #ccc;
    border-radius: 4px;
    box-shadow: 2px 2px 7px rgba(0,0,0,.375);
    overflow: hidden;
}
ul>li:hover{
    background-color: #999ddd;
}
ul>li>a{
    display: block;
    padding:6px 20px;
}