my custom atom style modify.

atom-custom-modify.less

/**
 * My custom CSS.
 *
 * Code by @trhgquan - https://github.com/trhgquan
 */

// The underline cursor for the text editor.
.editor .cursor {
  height: 1em !important;
  margin-top: 0.8em;
  border-left: none;
  border-bottom: 2px solid
}

// The vertical line cursor for the mini inputs.
.editor.mini .cursor {
  margin-top: 1em;
  border-left: 2px solid !important;
  border-bottom: none;
}

// Border radius for the selection zone.
.editor .selection .region {
  border-radius: 2.5px !important;
}
.selection .region {
  border-radius: 1.5;
}