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You could remove the border property on the learning tag, and its color is rgb(244, 208, 78) but yours is set to rgb(228, 228, 0).

Some other notes:

• Avoid using px, start using rem more and also em, %, vw, vh.
• Don't use height, let the browser determine the height your content needs.
• Start using CSS resets or normalizers.
• You can start using CSS variables it makes.
• Use display: block and max-width: 100% on your img to make it responsive.

Also using border-box is better than default which is content-box, you can set it up like this:

html {
  box-sizing: border-box;
}
*, *:before, *:after {
  box-sizing: inherit;
}