#tresc {
    font-family: "Gill Sans Extrabold", Helvetica, sans-serif;
    background-color: grey;
    margin-right: 80%;
}

body {
    background-size: 100% 100%;
    background-image: url("03-styropmin-1.jpg");
}

#main {
    background-color: grey;
    margin-right: 80%;
    
}

.kalkulator {
    border: solid, black, 100px;
    margin-right: 70%;
    background-color: rgb(255, 255, 255);
    text-align: center;
    
}

.absent {
    display: none;
}