*,*::after,*::before{ box-sizing: border-box;}

body{
    font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
    background-color: bisque;
}

header{
    background-color: blueviolet ;
    display: flex;
    justify-content: space-between;
    align-items: center;
}