How to stretch the block in width?

Question

css

footer{
    background: #f1f1f1;
    width:100%;
    margin-top:150px;
    height:300px;
    overflow:hidden;
    position:relative;
}

I'm making a footer for a website and ran into a problem that the footer doesn't reach the borders.

Answer 1

html, body { margin:0; padding: 0 }
or the footer has indents, it's better for you to look in the developer tools.