How do I get the box behind my text to reach the top and sides of the site?

the problem

As you can see on, the black box doesn't reach the top or sides of the site. I want it to, but how? Here's the css code:

#title {
        text-align: center;
        color: white;
        font-size: 80px;
        background: rgb(0,0,0, .6);

the id title is for my h1 header

I'm new to coding, sorry if something is wrong. Thank you!

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