Why is doesn't my content fill the full width in devtools responsive size

When visiting www.felkru.com and opening it in chrome devtools after resizing the window in responsive mode a bar appears on the right side of my content.The error also occures when zooming out on iOS. In Firefox, after following the same steps, no bar appears. How can I fix this?

>Solution :

picture problem. width: 100vw and padding section .about

solution:

#section {
  overflow: hidden;
}

or

#portrait {
  position: relative;
  left: 0;
  bottom: -0.3em;
  max-width: 100%;
}