input box not centering

For some reason, my website isn't centering an input box. Code:

@import url("https://fonts.googleapis.com/css?family=Ubuntu");

body { background-color: black; }

#textInput {
    position: absolute;
    top: 50%;
    right: 50%;
    width: 300px;
}

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">

    <link rel="stylesheet" href="style.css">
    
    <title>Digturd.io</title>
</head>
<body>
    <input id="textInput" type="text">
</body>
</html>

The textbox I created is, for some reason, not centered into body. Is there any reason why? Codepen: https://codepen.io/ARandomUncreativeName123/pen/oNqqeoY

Solution

@import url("https://fonts.googleapis.com/css?family=Ubuntu");

body { background-color: black; }

#textInput {
    position: absolute;
    top: 50%;
    left: 50%;
  width: 300px;
  transform: translate(-50%,-50%)
}

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">

    <link rel="stylesheet" href="style.css">
    
    <title>Digturd.io</title>
</head>
<body>
    <input id="textInput" type="text">
</body>
</html>

Just replace right: 50% to left: 50% and add transform.

#textInput {
    position: absolute;
    top: 50%;
    left: 50%;
    width: 300px;
    transform: translate(-50%,-50%)
}