place this CSS code in between <head> </head> section.
<!--css start-->
<style>.alrt {
padding: 20px;
background-color:#f2f2f2;
color: #cc0412;
border: 1px solid #02622880;
}
.closebtn {
margin-left: 15px;
color:red;
font-weight: bold;
float: right;
font-size: 25px;
line-height: 20px;
cursor: pointer;
transition: 0.3s;
}
.closebtn:hover {
color: black;
}
</style>
<!--css end-->
HTML place this code wherever you want to appear on your page.
<!--html start-->
<div class="alrt"><span class="closebtn" onclick="this.parentElement.style.display='none';">×</span>
<img src="https://4.bp.blogspot.com/-f7hJyneVxuI/XCRb5fhLUoI/AAAAAAAACqY/zKNllnc2f5A99i7kFD-BSTRSfM2eHghVwCLcBGAs/s1600/css-html-script-use.jpg" />
</div>
<!--html end-->
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