结束签到

!DOCTYPE html
html
head
meta charset="UTF-8"
title结束签到</title
style type="text/css"
body{
height: 2000px;
background-image: url(img/index_03.jpg);
background-repeat:repeat-x ;
background-position: left bottom;
background-attachment: fixed;
}
.back{
position: fixed;
right: 20px;
bottom: 20px;
}
.end{
position: fixed;
left:50%;
bottom: 20px;
transform: translateX(-50%);

}
.clock{
position: fixed;
left:10%;
bottom: 20px;
transform: translateX(-50%);

}
/style
/head
body
h1 id="top"我是顶部/h1
div class="back"
img src="img/OIP-C (1).jpg"/
div class="end"
img src="img/向上1 (1).png"/
/div
div class="clock"
将在15秒后刷新