Gutenburg: Remove border of selected block

It appears that the border is set by the following style definition on the block container (it is in block-editor/style.css):

.block-editor-block-list__layout .block-editor-block-list__block:not([contenteditable]):focus::after {
  position: absolute;
  z-index: 1;
  pointer-events: none;
  content: "";
  top: 1px;
  bottom: 1px;
  left: 1px;
  right: 1px;
  box-shadow: 0 0 0 var(--wp-admin-border-width-focus) var(--wp-admin-theme-color);
  border-radius: 1px;
  outline: 2px solid transparent;
}

Changing setting box-shadow to “none” removes the border.

Thus, adding this css will remove the border:

some-selector-to-the-container:focus::after{
    box-shadow: none !important;
}