html, body {
    height: 100%;
    margin: 0;
    padding: 0;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}
#ekran0 {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100%;
    margin: 0 15px 0 15px;
}
#plansza {
    background-color: orange;
    margin: 0;
    position: relative;
    overflow: hidden;
}

.elementgry {
    position: absolute;
}

#gracz{
    background-color: blue;
}
    #gracz.wywrotka {
        background-color: darkblue;
        animation: spin 1s linear infinite;
    }

.uczestnik {
    background-color: greenyellow;
    overflow: hidden;
    color: black;
    text-align: center;
}
    .uczestnik.wywrotka {
        background-color: darkgreen;
        color: white;
        animation: spin 1s linear infinite;
    }

@keyframes spin {
    from {
        transform: rotate(0deg);
    }
    to {
        transform: rotate(360deg);
    }
}