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

body {
    background-color: rgb(16, 16, 16);
    color: rgb(160, 160, 160);
    margin: 0; 
}

.fullviewport {
    width: 100%;
    height: 100vh;
}

.center-within {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;