Hello,
For your needs I suggest you to use/modify your Css code, for customize your product page via your Css,
have a look on this link,
here
.
Note : I advice you to edit your Css file at the end, later that will be easier to find and correct it.
As example :
@media (max-width: 767px)
[class*="span"], .uneditable-input[class*="span"], .row-fluid [class*="span"] {
float: none;
display: block;
width: 100%;
margin-left: 0;
}
To learn more about Css code and their properties, I invite you to read this source,
here
.
And more especially
this point
about
@media in order to have
several Css order link to screen size.
Hope that will help you.
Regards,