.footer {
padding: 20px;
width: 75%;
background-color: white;
color: black;
font-family: "Exo", sans-serif;
display: flex;
justify-content: center;
}
You can use flexblox in order to align items in a one-dimensional way. I used the width you’ve given the body of your page (75%).
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solved Is it possible to centre a footer box in HTML/CSS?