Hello,
you can use some custom Css command in order to get or modify this.
First have a look on
this tutorial
to see how to add custom css command.
The other point to consider in your case, is the @media css command, have a look on
this documentation
, this will help you to understand how to manage responsiveness.
Then, in order to guide you, this kind of css command can do the trick :
div.container_html .unwanted_html_imag_class {
display: none;
}
And in order to replace it by another icon, always via css :
div.container_html {
content: url('url-link/new-img.png');
}
Hope this will help you to get what you need.
Regards