display flex for the reponsiveness

Hey I saw your site and it is ok but I recommend you to remove the margin to the div with classes: 'all' and 'in-all' and use padding instead, this gonna make that the elements add a "intern margin" instead outside and this wont break your layout, also you can check this link: https://developer.mozilla.org/en-US/docs/Web/CSS/padding. And also you can use the "background-image"(https://developer.mozilla.org/en-US/docs/Web/CSS/background-image) property to set a image as background instead create 2 "img" tags.