Why won't my background-size change in CSS?

July 29, 2023

The white box with the cut off form to the left is the background here.

I temporarily took out all other styling and this is all that is left (some of it is not mine):

body {
    margin: 0;
    font-family: -apple-system, Arial, sans-serif;
    font-size: 1rem;
    font-weight: 400;
    line-height: 1.5;
    color: #69ce16;
    text-align: left;
    background-color: #fff;
    background-position: center;
    background-size: 20%;
    background-repeat: no-repeat;
    padding: 30px;
    padding-bottom: 10px;
    border: 1px solid #ced4da;
    border-radius: 0.25rem;
    width: 50%;
}

I added the background size, repeat and position myself and even tried adjusting every other value there but nothing has worked. I used developer.mozilla.org for info on every single one of those css properties, so I have no idea why it won’t center to the middle of that "grey" page, or anywhere I want it, and even trying to reduce its size/width has not worked.

>Solution :

Try changing your width for example to

body{
   ...
   width: 50%;
   /* maybe add some height? */
   height: 500px;
}

Then you will see a change

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <style>
    body {
    margin: 0;
    font-family: -apple-system, Arial, sans-serif;
    font-size: 1rem;
    font-weight: 400;
    line-height: 1.5;
    color: #69ce16;
    text-align: left;
    background-color: white;
    background-position: center;
    background-size: 20%;
    background-repeat: no-repeat;
    padding: 30px;
    padding-bottom: 10px;
    border: 1px solid #ced4da;
    border-radius: 0.25rem;
    width: 80%;
    height:200px;
}</style>
</body>
</html>