It takes 2/3rds to remove. That makes sense too, thinking in the context of appointments. A judge can be appointed by a simple majority advise & consent. But if Congress sees that its will is being subverted by a judge, a supermajority can remedy a past error of Congressional judgement.
Clause 6: The Senate shall have the sole Power to try all Impeachments. When sitting for that Purpose, they shall be on Oath or Affirmation. When the President of the United States is tried, the Chief Justice shall preside: And no Person shall be convicted without the Concurrence of two thirds of the Members present. (Article I, Section 3)
The politicians won't do their job and remove these judges for their crazy decisions because they want the judges to make these hot button social decisions so they don't have to take a stand and lose some votes.
And the people, distracted by bread and circuses, fall for the gambit every time.
It is the trial that takes place in the Senate and a two thirds of those present to convict.
Some if impeached by the House resign to avoid trial in the Senate.