Hintergrundfarbe keine
element {
background-color: transparent;
}
Long Finned Pilot Whale
element {
background-color: transparent;
}body {
background-color: green;
}body {
background-color: rgb(255,255,255);
} body {
background-color: red;
}html,body {
background-color: red;
}div {
opacity:25% ;
}