body { background-color: #efefef; 
background-image: url("https://images.cnblogs.com/cnblogs_com/hentai-teapot/1934133/o_210220083752(pid-13293546)過去絵 ヱヴァンゲリヲン新劇場版_破.jpg"); 
background-repeat: no-repeat; 
background-attachment: fixed;
 background-position: center 0;
 background-size: cover; }

body{
position:relative;
}
.img {width: 20px;height: 20px;opacity: 1;position: absolute;z-index: 100000;transition: 1s;}
.left,.right {width: 10px;height: 10px;border-radius: 100%;position: absolute;}
.right {right: 0;}
.under {width: 10px;height: 10px;position: absolute;top: 5px;left: 5px;transform: rotate(45deg)}
.text {width: 50px;font-size: 10px;line-height: 1;position: absolute;top: -1em;left: -15px;text-align: center;}