If you are using a series of button_to UrlHelpers in Rails and want the buttons to line up horizontally on a row you can use this CSS to accomplish it:

/* ./app/assets/stylesheets/button_to.css.scss */  
form.button_to {  
    margin:0;
    padding:0;
    display:inline;
}

form.button_to div, form.button_to div input {  
    display:inline;
}

If you are using Rails 3.x's asset pipeline, remember to add a line to your application.css to include the button_to asset - assuming you're breaking out your styles into separate files.