سلام.
<html>
<head>
<style>
.banner_wrapp{
position: absolute;
bottom:0;
left:0;
right:0;
width: 100%;
text-align:center;
}
.banner_wrapp img{
width: auto;
max-width: 100%
}
.banner_wrapp .banner_link{
display: inline-block;
}
.banner_wrapp .close_me{
border-radius: 50%;
position: absolute;
top: -25px;
font-size: 20px;
color: #7b7979;
cursor: pointer;
display: block;
font-family: Arial;
padding: 2px 7px;
}
.banner_wrapp .close_me:hover{
background-color: #b9b9b9;
color: #fff;
}
</style>
</head>
<body>
<div class="banner_wrapp