body {
    background-color: #1e1e20;
}

.wrapper {
    display: flex;
    justify-content: center;
    padding: 50px;
    height: 100%;
}

.container {
    display: flex;
    justify-content: center;
    align-items: center;
    position: relative;
    width: 90vw;
    height: 90vh;
    background-color: #444;
}

.container__line {
    display: flex;
    justify-content: center;
    align-items: center;
    position: relative;
    width: 83vw;
    height: 77vh;
    border: 10px dashed #fff;
    background-color: #444;
}

.block {
    background-color: #7e0000;
    height: 100px;
    width: 100px;
    top: 5px;
    left: 5px;
    position: absolute;
    z-index: 1;
}

.square {
    position: relative;
    width: 75vw;
    height: 65vh;
    background-color: #004d06;
}

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

.block {
    animation: block-anim 6s 2s infinite alternate;
}

@keyframes block-anim {
    0% {
        top: 5px;
        left: 3px;
        background-color: #7e0000;
    }
    25% {
        top: 5px;
        left: 82.5vw;
        background-color: #020070;
        border-radius: 100px;
    }
    50% {
        top: 78vh;
        left: 82.5vw;
        background-color: #7e0000;;
        border-radius: 0;
    }
    75% {
        top: 78vh;
        left: 3px;
        background-color: #020070;
        border-radius: 100px;
    }
    100% {
        top: 5px;
        left: 3px;
        background-color: #7e0000;
        border-radius: 0;
    }
}