body {
    background-color: yellow;
}

h1 {
    background-color: yellow;
    color: black;
}

.line1 {
    background-color: green;
    color: red;
}

.line2 {
    background-color: green;
    color: blue;
}

.line3 {
    background-color: white;
    color: brown;
}

.line4 {
    background-color: white;
    color: green;
}