*{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

body{
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
}
.main-header{
    text-transform: uppercase;
}