How to have the same view from desktop on mobile view?

Site URL: http://juliaortegon.com

Hi Everyone, 

I'm new here and working on my website. I decided to use the template "Brine" and was ready to publish. However the mobile version doesn't look to what I designed and liked. Is there a way to have the same view on all devices? 

I also added a floating button and looks huge in device view. Would you know how to make it smaller? Thank you so much for your help! 

you mean title (left) - description (right) and 3 images/row?

Add this to Home > Design > Custom CSS to resize float button

/* Fix float button not clickable */
a.t-button {
    z-index: 999;
}
@media screen and (max-width:640px) {
a.t-button {
    padding: 0.5em;
}
}