landing page with two column layout master using css flex box

Nice solution but I noticed you used padding: 60px to surround each section.

The only problem with this is that on a bigger screen it fails, I mean the layout looks weird. So I'll suggest using something like this:

.container {
  width: 90%;
  max-width: 1440px;
  margin: 0 auto;
}

Using those properties will ensure the width is always 90% until it gets to the max-width