Make the page content container full-bleed/full-width

Site URL: http://www.katejiyeonkim.com/make-it-loud-and-clear

Hi, I am trying to make the first image of the page full-width.

All the elements are contained within the page content box and I am unsure if there is a specific code to only have the first image full-width vs making the entire content box full-width.

Does anyone have solutions?

http://mcqueenmcqueen.com/thelastdavinci

here is the reference website of what i am trying to achieve 

Thanks

Add to Page Settings > Advanced > Header

<style>
main#page {
    padding-left: 0;
    padding-right: 0;
    margin-left: 0;
    margin-right: 0;
    max-width: 100%;
}
main#page .columns-12 .span-12>div:not(:first-child) {
    max-width: 1280px;
    margin-left: auto;
    margin-right: auto;
    padding-left: 3vw;
    padding-right: 3vw;
}
</style>