body, html {
    padding: 0px;
    margin: 0px;
    background-color: black;
}
#cymk {
    display: grid;
    grid-template-columns: auto auto auto auto;
    height: 100vh;

}
#cyan {
    background-color: cyan;
    height: 100%;
}
#yellow{
    background-color: yellow;
}
#magenta {
    background-color: magenta;
}
#key {
    background-color: black;
}
#filter {
    height: 90vh;
    width: 90vw;
    background-color: rgba(0, 0, 0, 0.500);
    position: absolute;
    top: 5vh;
    left: 5vh;
}
#hallo {
    margin: 10%;
    text-align: center;
    font-size: 5em;
    color: white;
    font-family: cursive;
}
a {
    color: pink;
}
a:visited, a:hover, a:active{
    color: hotpink;
}