关闭按钮：

<em class="close"></em>

  .close {
		width: 16px;
		height: 16px;
		text-align: center;
		display: block;
		color: #28c54d;
		/*background-color: #DEF6E4;
		// background-color: #ffffff;
		// border: solid 2px #caf0d3; /*!no*/
		border: solid 2px #fff; /*!no*/
		font-style: normal;
		font-size: 20px; /*!px*/
		line-height: 80px;
		position: absolute;
		bottom: 2px;
		right: 0px;
		z-index: 1000;
		/*// margin: auto auto 50px auto;*/
        border-radius: 50%;
        background: #b0b0b0;
    }
    
    .close:before {
        content: "";
        position: absolute;
        width: 4px;
        /* height: 1px; */
        display: block;
        background-color: #fff;
        transform: rotate(45deg);
        top: 5px;
        left: 3px;
        border: solid thin #fff;
        border-radius: 1px;
    }
    .close:after {
        content: "";
        position: absolute;
        width: 4px;
        /* height: 1px; */
        display: block;
        background-color: #fff;
        transform: rotate(-45deg);
        top: 5px;
        left: 3px;
        border: solid thin #fff;
        border-radius: 1px;
    }