Background changer web extension code not working

Question

For some reason this chrome extension that i've made won't actually update my chrome.

I followed through a tutorial and it still isn't working. What am I doing wrong? Thank you for your help!

Extension is considered to not have to change the website even though the purpose is that it would

I've got the code below: manifest.json

{
    "manifest_version": 2,
    "name": "bChanger",
    "description": "play a custom video to google.com",
    "version": "1.0",
    "icons": {
        "16":"/images/icon.png"
    },
    "page_action": {
        "default_icon": {
            "16": "/images/icon.png"
        }
    },
    "content_scipts": [
        {
            "matches": ["https://www.google.com/*"],
            "css": ["main.css"]
        }
    ]
}

main.css

html body {
    background: url(https://cdn.pixabay.com/photo/2015/04/23/22/00/tree-736885__480.jpg);
}