body {
    background-color: #1a1a1c;
    font-family: sans-serif;
    font-weight: 600;
}

.wrapper {
    display: flex;
    align-items: center;
    justify-content: center;
    height: 100vh;
}

.conteiner {
    background: #3b3a3d;
    border-radius: 15px;
    width: 90%;
    height: 90%;
    position: relative;
}

.block {
    position: absolute;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 200px;
    height: 200px;
}

/* ===================================== */


.block {
    animation: move-block 3s infinite;
}

@keyframes move-block {
    0% {
        left: 0px;
        top: 0px;
        border-radius: 10%;
        background-color: #9adfff;
        color: #000550;
    }

    25% {
        left: calc(100% - 200px);
        top: 0px;
        border-radius: 50%;
        background-color: #ffa4a4;
        color: #530000;
    }

    50% {
        left: calc(100% - 200px);
        top: calc(100% - 200px);
        border-radius: 10%;
        background-color: #99ffb8;
        color: #073b00;
    }

    75% {
        left: 0px;
        top: calc(100% - 200px);
        border-radius: 50%;
        background-color: #fff6a9;
        color: #515a00;
    }

    100% {
        left: 0px;
        top: 0px;
        border-radius: 10%;
        background-color: #9adfff;
        color: #000550;
    }
}