header {
  text-align: center;
}

footer {
  width: 100%;
  text-align: center;
}

body {
    background-color: white;
}

div {
  width: 100%;
  height: 80px;
}

a {
  color: black;
  text-decoration: none;
}

img {
    display: block;
    margin-left: auto;
    margin-right: auto;
}

h1 {
    text-align: center;
    color: black;
}

h3 {
    text-align: center;
    color: black;
}

p {
    color: black;
}

table {
    width: 320px;
    color: black;
    display: block;
    margin-left: auto;
    margin-right: auto;
}

@media (prefers-color-scheme: dark) {
    a {
        color: white;
        text-decoration: none;
    }
    
    body {
        background-color: black;
    }
    
    h1 {
        text-align: center;
        color: white;
    }
    
    h3 {
        text-align: center;
        color: white;
    }

    p {
       color: white;
    }
    
    table {
        color: white;
        display: block;
        margin-left: auto;
        margin-right: auto;
    }
}