*{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: "Josefin Sans", sans-serif;
}
body{
    width: 100%;
    height: 100vh;
    animation: changeBg 10s linear infinite;
    display: grid;
    place-items: center;
}

@keyframes changeBg {
    0%{
        background-color: red;
    }
    20%{
        background-color: royalblue;
    }
    40%{
        background-color: greenyellow;
    }
    60%{
        background-color: rosybrown;
    }
    80%{
        background-color: wheat;
    }
    100%{
        background-color: red;
    }
}